PER- 
-—ty 
a iténé tim) #. 
nat. 
elected (pér — nm. [Gk. pert 
round ; ¢rewa, le.] The margin 
of a shell- -openi eg “the small plate 
perforated by the ’ spiracle- opening 
in Insects (zoo/. 
eS an (per'itrikits) a. [Gk 
ound; “Arix, hair.] Having 
of cilia arranged 
peritroc . 
peri, round ; fvochos, a wheel.| A 
ae ear seats ciliated 
comercphaa (pér’ itréf'ik) a. [Gk. perz 
round ; /rophe, food.) Appl. a fold 
of membrane in the latter part of 
the intestine of Insec ts (zool.). 
ese pap deri a. [Gk. 
v perk roun scera, nai 
Su rrounding ‘ne ieee: appl. t 
body 
ceseoeni erie (per ‘{vitél seo a. [Gk. 
peri, round ; vitellus, yolk of 
egg.] pane the yolk of an 
Rad 
a rtilage,—cartilage 
which Hesaias. ‘unossified thro — 
permanen teeth,— 
pe developed after the itt or decidu- 
ous dentition ; the second set of 
most, the third set of some, the first 
set of other Mammals. 
rmanent t —tissue consisting 
of cells which have completed their 
period of growth an nd 
change little till err lose their 
protoplasm and die (02). 
Permian (pérmiain) 4. [Perm, E. 
PER- 
Russia.] The sixth rock-system of 
ri. peronatus, 
oted ae overed_ wit 
ra 3_ Powdery or me aly 
; appl. ana 
perenentibia (per Sng 5tib al) a. [Gk. 
perone, fibula; L. tba, the tibia.] 
i ula and 
processes ascen 
margin towards the centre (zoo/.). 
eroral (pérd'ral) a. (L. per, spite de 
OS, cose gh (ppl. a membran of 
Infusoria formed by canceatiace 
of rows of cilia (zool.). 
peroxidas © (pérok sidas) n. [T- per, 
through ; oxys, shar 
perradius 
through ; ann. ara ius fa 
four primary radii of Coelenterates 
zool, 
persistent (pérsis ak se eae 
through : scar 
fh. persona 
person.] An Csivietued or zooid of 
a colony (zoo/.). 
mate (pér’sénat) a. [L. pers 
atus, masked. Appi. a corolla of 
"per through 
xudation or ‘excretion through the 
LYS.» 
pertusate (pérti’sat) a. [L. per tus: 
us, 
thrust through.] Pierced at the 
apex (dot.). 
perula wedi or pérooli) 2. [Gk. 
pera, a wallet.) A 1 leaf-bud scale 
(bot.). 
rvalvir) a. [L. p 
through ; cadued folding- eos 
