PRO- 
head-kidney of embryonic eis 
arising from erties a 
a time lo wet 
functional for 
vertebrates, later replaced Sy meso- 
ba 
before ; oon, back.] 
part of the prothoras of Insec 
(zool.). 
oe ph ace wn [Li pro, 
before ; sucleu. rnel.] The egg- 
or rob -nucleus during 
Zool. 
proostracum — oe nm. [Gk 
pro, for; ostra a_ testacean 
shell.] The horn ay pn 6 of a deca- 
pod dibranchiate shell or Belemnite 
prootic (proot’i st n. (Gk. pro, ered. : 
ous, Car nterior bone of th 
otic capsule i in vertebrates (zool. ee 
(prop'aga'tiv) @.  [L. 
ductive ; afpi. a cel 
ee “ a colony bio 
aes) n. [L. 
te.] A bud 
nt 
before ; phasis, appearance.] 
preparatory changes, elie first hes 
in mitosis (¢yZ 
phloem,—pr 
prophototropism fom (pet répizm) Nn. 
[Gk. pro, for ; Bai light ; ¢vope, a 
um (profil’iim) #. [Gk. Z 
See: S payllos leaf.] A small bract 
(60 ot). 
propleuron (préploor’én) 7. [Gk. pro, 
ore; pleura, side.) A lateral 
ne of the prothorax of Insects 
ropo'dédn) #. [Gk. pro. 
-2 7 foot.] An abdominal 
t edian segment, 
segment, etc. (z00/.). 
257 
PRO- 
propodeum,—propodeon. 
propodite (pro’pédit) # [Gk Z 
before ; — foot.] In Mala wi 
traca, the segment of a foot sixth 
from the body (zool.). 
propodium (pré po’aiiim) 7. [Gk. pro, 
enares pous, foot.] The small 
anterior part of a Molluscan foot 
pro rygium — prop’- 
eerij fam) before ; 
plerygion, a little w eG "The ) 
most of three basals supporting the 
pectoral fin of ee age Zool. a 
propulsive pseudopodium Ss 
— ecinets 2B a peendopodh de: 
eloped posteriorly which by its 
elongation pushes the body forward 
(pro’ si 
propupa pee pa) #. [L. pro, before ; 
pupa, pet.] A stage in insect 
metamorphosis preceding the pupa 
aeige te (zoo 
pro repyeatum ‘(pra’ ee nm. [Gk. 
— before ; Ayge, the p.} The 
rsal late anterior to the > oypidhin 
Z00t. 
prorachis (prorak’is) | n. [Gk. fro, 
re 
coincides with the as cee — ct 0 
the iene z00i 
proseapula (proskap fala) [L. pro, 
before ; scapula, shoaidet - blade.] 
The clavicle (z00 
6 [Gk. fra, 
cyst with fluid-filled cavity, a stage 
— of the Tape- 
worm (00 
prosecretin (prd'sékré é'tin) 7. s pro, 
before ; secrefus, separated 
precursor of secretin (f/ys.). 
prosence ep (prés’ tiene -séf-) 
n. [Gk. 2 before ; engkephalon, 
brain.] ‘The telencephalon, or fore- 
ea 
Pisiesqewewn (prdséng’kima) m [Gk. 
engchyma, infusion. ] 
The 
[Gk. pros, 
tefoaipt. |] Appl. elongated pointed 
cells, with thin or thick cell-walls, 
rege de tissue (Go07.). 
ams hmoid (proséth’moid) nm. [Gk. 
pros, near; ethmos, sieve. n 
R 
