opiparous 
opiparous (o-pip'a-rus), a. [< L. opiparus, rich- 
4128 
opisthotic 
shoulder-girdle. The keel of the sternum is cut away 
in front, and the sides of the bone are double-notched be- 
hind; the clavicle is ankylosed with the coracoid and 
with the sternal manubrium. 
Sweet odours and perfumes, generous wines, opiparmis 01 ji s tliOCOinine (op-is-thok'o-min), a. [< Opis- 
fare, &c. Burton, Anat. of Mel., p. 312. g> ,"""+ .j,,^ Pertaining to the Qpistho- 
Opiparously(o-pip'a-rus-li),cto. Sumptuously, comidcc, or having their characters. 
--- "-- * T ....:... wi. O'J . , /_,, Zr, 4-ltnl.r'sv viici\ 
\j\JilitijL \j \.L>' \\- ,f *i' ;7 /i - t \ i 
ly furnished, sumptuous, < L. ops (op-), riches, 
4- imrare, furnish.] Sumptuous. [Rare.] 
OpisthogHcithus nigromarginatus. 
and GiiittJti/papx, with about 12 species, inhabit- 
, ,_-. . . . long behind, lit. having hair behind <. mrtaoev, illg rocky bot t om s of tropical seas. 
instrument for measuring curved lines upon a behind, + KO.U?, the hair: see coro2.] Having op igthognathous (op-is-thog'na-thus), a. [< 
map. The instrument consists of a wheel turning as a an occipital crest, as the hoactzin. L Hmstliotmathus, < Gr. hnofcv.' behind, + yva- 
rtS*"?f^52. 1 !??J l l5*fe^ t iS l 5LS Opisthocomus (op-is-thok'o-mus), n. [NL.: flofj j aw .] &aMtf,r^o/.,havingretreatingjaws 
a stop, or to 
see opistliocomoits.] 
it aiULj. Ul WJ t* uiiun, *n\*.ivtvwi ~j r 1 - --- 
the line on the map so as to unscrew it, and is then rolled 
back over the scale to its former position. 
The contents of Mr. Stanford's shop seemed to have 
been scattered about the room, and Bell had armed her- 
self with an opisometer, which gave her quite an air of im- 
portance. V. Black, Phaeton, m. 
Opistharthri (op-is-thiir'thri), n. pi. [NL., < 
Or. omoflev, behind, + a/jtipov, joint.] A sub- 
order of Squali or sharks, having the palato- 
quadrate apparatus connected with the postor- 
bital processes of the skull, the mouth inferior, 
the branchial apertures six or seven in number, 
and only one dorsal fin. They are represented 
by the cow-sharks or Notidanidce. 
opistharthrous(op-is-thar'thrus), a. [< Gr.omo-- 
feij behind, + apff/mv, joint.] Of or pertaining 
to, or having the characters of, the Opistharthri. 
opisthen (o-pis'then), n. [NL., < Gr. 6^taBev, 
behind.] A hinder or rear part of the body of 
an animal. 
opisthion (o-pis'thi-on), n.; pi. opisthia (-a). 
[NL., < Gr.' bvioBiov, neut. of imioBtof, hinder, < 
biriadev, behind.] The middle of the posterior 
boundary of the foramen magnum of the skull, 
opposite the basion. See craniometry. 
opisthobranch (o-pis'tho-brangk), n. and a. I. 
n. A member of the Opistliobranchiata. 
II. a. Having posterior gills ; specifically, of 
or pertaining to the Opisthobranchiata. 
Opisthobranchia (o-pis-tho-brang'ki-a), n. pi. hoactzin. Also called Orthocorys and Sasa. 
[NL., < Gr. iiKiaSev', behind, + ftpayxia, gills.] opisthodome (o-pis'tho-dom), n. [< opisthod* 
~ame as Opisthobranchiata. 
-thok'o-mus), n. [NL. : 
The only known genus of or " teeth : the opposite of prognathous. 
opisthograph (o-pis'tho-graf), . [< Gr. bme- 
(/u;yja4>of, written on the back, < bviaOev, behind, 
+ ypcupeiv, write.] 1. In classical antiq., a manu- 
script written, contrary to custom, on the back 
as well as the front of the roll of papyrus or 
parchment. 2. A slab inscribed on the back as 
well as the front, the side bearing the original 
inscription having been turned to the wall, and 
the other side utilized for a later inscription. 
Not a few of the slabs, it is discovered, have done double 
duty, bearing a pagan inscription on one side, and a Chris- 
tian one on the other. These are known as opisthtujraphs. 
Eneyc. Brit., V. 209. 
opisthographic (o-pis-tho-graf'ik), a. [< opis- 
thogruph + -ic.] Written or printed on both 
sides, as a roll of parchment or papyrus. 
opisthography (op-is-thog'ra-fi), n. [< Gr. as if 
'bjnathypaijiia, < bttia66ypatyo(, written on the back : 
' 
seeopistkograph.'] The practice of writing upon 
the back of anything ; especially, writing on the 
back as well as the front of a roll of papyrus 
or parchment. See opistkograph. 
Opisthomi (op-is-tho'mi), n. pi. [NL., < Gr. 
bviadev, behind, + a/to{, shoulder.] An order 
of physoclist teleost fishes, (a) In Cope's classifi- 
cation, the same as the family Notacanthidce. (b) In Gill's 
system, a group containing the Notacanthidce and Masta- 
cembelidte, and denned as the teleosts with completely dif- 
ferentiated jaws, scapular arch discrete from the skull and 
suspended from the vertebral column, the dorsal fin rep- 
resented by spines, and the ventrals abdominal or none. 
Opisthomidae (op-is-thom'i-de), n. pi. [NL., < 
Opisthomum + -idee.] A family of rhabdocoe- 
lous turbellarians, typified by the genus Opistho- 
* .-,_.__,., _ mum, having the mouth at the opisthen or pos- 
eart : opposed to Prosobrancliiata. They have a In Gr. arch., an open vestibule within the por- ter j or en( j o f t ne b O( jy leading into a tubular 
latively large foot and small visceral hump, with short tieo at the end behind the cella in most ancient protrusible pharynx. See cut at Jthabdocala. 
Hoactzm (Opisthocomus cristatus). 
Opisthocomidas. There is but one species, 0. 
hoactzin or 0. cristatus, of South America. See 
mos, q. v.] Same as opisthodomos. 
heart 
shell-less in the adult state, and many of them lose the 
ctenidial gills and mantle-flap, respiration being effected 
by very diversiform supplementary organs. Hence the 
equally various methods of subdivision of the order, and 
the application to its divisions of exceptionally numerous 
names ending in -branchia. The opisthobranchs are ma- 
rine and littoral gastropods of more or less slug-like as- 
pect, and many of them are known as sea-duys, sea-hares, 
sea-lemons, etc. See Nudibranchiata, Tectibranchiata. 
opisthobranchiate (o-pis-tho-brang'ki-at), a. 
and n. I. a. In Mollusca, having the gills in 
such a position that the blood must take a for- 
ward course to reach the heart. 
II. n. An opisthobranch. 
opisthobranchism (o-pis-tho-brang'kizm), n. 
[< opixthobranch + -ism."] Disposition of the 
gills of a mollusk behind the heart ; the charac- 
per ipteral or dipteral temples, corresponding 
Plan of the so-called Theseum, at Athens. 
N, cella ; p, pronaos ; o, opisthodomos. 
to the pronaos at the principal end, into which 
opens the main entrance. Also called epinaos 
and posticum. 
^ ^ i-tho'mus), a. Pertaining to 
the Opisthomi, or having their characters. 
Opisthomum (o-pis'tho-mum), n. [NL., irreg. 
for * Opisthostommn, < Gr. dmottfv, behind, + 
cn-6/ia, mouth.] The typical genus of Opisthomi- 
dcc. 0. pallidiim is an example. 
Opisthophthalma (o-pis-thof-thal'ma), n. pi. 
p^L., < Gr. bviaQev, behind, + 600a/l/io<:, eye.] 
A group of rostriferous gastropods with the 
eyes sessile on the back, between or rather be- 
hind the bases of the tentacles, containing the 
families Aciculidce and Rissoellidce. J. E. Gray. 
n. pi. [NL., 
astric (o-pis-tho-gas'trik), 
hind, + yaarr/p, stomach, 
stomach. 
classification of fishes, a subfamily of Sihiritlte, 
containing South American catfishes. 
'te-rus), n. [NL., < 
. vowing, fin.] Age- 
giving name to the Opis- 
~ ' thopterce. Gill, 1861. 
opisthopulmonate (o-pis-tho-pul'mo-uat), " 
der of Crocodilia named by Owen, containing 
extinct reptiles with opisthocoslous vertebra, 
as in the genera Streptospondylus and Cetiosau- Onist'hinrlntKsaCo-ni'i-tho-fflos'a^ > nl TNL < - , * - 
rus, of Melozoic agTlt is placed by later writ- ^X^SK^K fil In Gun- ?!r!^5^g^^l^*S?5^ 
ers with the dinosauriau reptiles. 
opisthoccelian (o-pis-tho-se'li-an), a. and n. 
[< Opinthoccelia + -an.] 1. a. 1 . Hollow or con- 
cave behind, as a vertebra : applied to vertebras 
whose bodies or centra are concave on the pos- 
terior face. 2. Having opisthocoelianvertebree, 
tiler's classification, one of three primary di- 
visions of salient batrachians, correlated with 
Aglossa and Proteroglossa, having the tongue 
those pulmonate gastropods in which the pulmo- 
nary sac is posterior, the ventricle of the heart 
anterior, the auricle posterior, and the pallial re- 
1 gion small : the opposite of prosopulmonate. 
attached m front and free behind. Itcontamed ^ isthos p nendon ^ ( o. p is-tho-sfen'do-ne), n. 
18 families, or nearly all of the order, and was 
divided into Oxydactyla and Platydactyla. 
A reptile with opisthocoelian vertebrre, 
or belonging to the order Opisthocwlia. 
opisthocoelous (o-pis-tho-se'lus), a. [< Gr. b-rria- 
oocome f 6 ms'tho kom^ * A bird of the 
ome ^o-pis tno-Kom), n. A Dira ot tne 
fixed in 
front, as the tongue of an opisthoglossate am- 
phibian. 
opisthoglossate (6-pis-tho-glos'at), a. [As opis- 
thotjlossa + -ate*.] Pertaining to the Opistho- 
glossa, or having their characters. 
[< Gr. imiadoaifievfiovr^ (see 
def 
+ 
head-t 
done.] In ancient Greek 
genus OpiKthacomus; a .hoactzin. 6pisthoglyphia'(6-pis-th6-glif'i-a),n.;)?. [NL 
Opisthocoml(op-is-thok'o-mi),.p/. [NL.,pl. ^ G r. o^X, behind, " 'L-.~^ 
Opisthosphendone. 
(From a Greek red-figured 
vase.) 
-. f. - - . . i- - N \ji*. u/.wi/c*'. uvu-iuu, + yXvdi//, carvnig.] A 
of Opisthocomus, q. v.] An order of birds, repre- of Opfe ^ a or serpents/in which some of 
sented by the genus Opisthocomus. it is an anom- f he posterior maxillary teeth are grooved. 
aluus group, tne sole survivinji r&Dre86ntatlT6 of an an- .t i i_. /- ii ~ TJ./-I \ r 
cestral type of birds related to the OaUince. See Opistho- OplSthoglyphlC (o-pis-thp-glif 'ik), a. [As ,,/nx- 
comidae. Heteramvrphce is a synonym. tlioylypli + -ic.] Having grooved back teeth ; 
Opisthocomidse (o-pis-tho-kom'i-de), n. pi. of or pertaining to the Opisthoglyphia. 
[NL., < Opisthocomus + -idee.] A family of Opisthognathidas (o-pis-thog-nath'i-de), n. pi. 
birds alone representing the order Opisthocomi, [NL., < opisthognathus : see OfitStognaOnHU.] 
typified by the genus Opifiihoeomvs, having an A family of fishes, related to the blennies ami 
enormous crop and anomalous sternum and star-gazers, containing 2 genera, Opixthognathus ear): see otic.] I. a. Posterior and otic; 
hair, in which a plain 
or ornamented band, 
broad in the middle and 
narrow at the ends, sup- 
ported the mass of hair 
behind the head and was 
fastened in front. It is 
distinguished from the kekry- 
phalos in that it does not cover the top of the head. 
sphendone. 
opisthotic (op-is-thot'ik), a. and w. [< Gr. 
OT/O&V, behind, + m\- (UT-), ear (> uri*6f, of the 
fiar^: see otic.'} I. a. Posterior and otic; of 
