PER- 
microspore- eg of certain 
Pteridophytes (d00.). 
—— (p@ riddis zohan n. [Gk. pert, 
und ; 5s, a way.] The fulfil- 
cent of Reema * regular periods 
or intervals ; rhythm 3 
perioesophageal (per'ie’ sofsje’Al) a. 
[Gk aac round; cet ya gullet. ] 
ae) ; appl. 
$i 
most 
periotie (péridt'ik) . [Gk. peri, 
s, € A cranial bone 
aryngeal (pér'ifarin’ — a. 
[Gk. Jeri, round ; pharyng: ea 
Encircling or surroun ny 
ses appl. the cilia of Ascidi- 
s (zool..). 
peripheral (périf’éral) a. [Gk. peri, 
round ; pherein, to bear. — 
from the centre ; near the um- 
ference ; ces end- <r eo oft aareel, 
' nervous dies m (a7, 
peripheri (périfé zl) a. [Gk. 
= ea si ati Ps bear. | 
a or less 
“eter sinersioreddine: pe endo- 
part. 
periphysis prions 
round ; physis, g 
Fungi, a cama 
(Gk. feré 
citi] In certain 
a hymenium without asci (404). 
periplasm (périplazm) #. [Gk. fer, 
roun : 
nN oogonium outside 
the oosphere, in Fungi i" 
periplast (périplast) [Gk. peri, 
round ; #/astos, mould 
attraction sphere (eyt.) ; 
plasm of flagellates ; the Sho eticle 
234 
PER- 
certain ti 88 ;  inter- 
cellular substance of tissues (zoo/. ‘ 
— stie (péripnii’ stk) a. [Gk 
peri, round ; ,pneustits, pert. breath- 
1 bee: Having s ——— arranged 
along the sides of th sr borigt normal 
in insect larvae (zoo, 
—— (pér’ mo HE [Gk. peri, 
und; proktos, anus. }_ The eT 
immedi ately oe the an 
of Echinoids (goo/.). 
pe eeannd | (périsark) 2. [Gk. fer?, 
ound ; sarx, flesh.] The tough 
siete membrane of Hydrozoa (zoo/.). 
sklé’ral) a. 
hime hard.]| Appi. 
sth ie seed. ] 
und ; sporos ; A sp 
— othes cell in Algae 
s (40 
ristalsis (pee ogi ie —_; peri, 
nse stellein ce.] Move- 
of the pes rac by which 
food is — d and absorbed, by 
ns of  involunt a apart 
(phys +). 
peristaltic (pér'istal'tik) a. [Gk. i 
round ; séellein, to = e.] Appl. 
e€ movement ich food is 
digested, forced ng oe the aliment- 
ary canal (phys.). 
ristethium (pér‘ista’ thitim) 7. [Gk. 
- — breast.] An 
insect mesost 
peristome (péri stom) nm. (Gk. 
round ; sfoma, ves 1c kee region 
surrounding the mouth ; — : 
connection vith ] Tatas (bot. ), Vorti- 
cella, Actinozoa, Annulates, nea 
(zool.). 
perisysto. a ee tolé) #7. [Gk.Z 
a drawin epee 
The elapsing betwee 
dsl and systole of the heart 
uy 
perithecium (périthé’shiiim) 7. [Gk- 
