324 
OL08SART. 
Those Ungulates with an un- 
even number of toes, as the 
horse. 
Pe-ri-to-ne'um {Qd'.peri, around ; 
teino, I stretch). Tiie mem- 
brane lining the abdominal 
walls and covering the enclosed 
viscera. 
Per-i-vis'ce-ral (Gr. ;?m, 
around; Lat. mscera, the inti i-- 
nal organs, especially of the 
abdominal cavity). The body- 
cavity containing the alimen- 
tary canal with its outgrowths. 
Pha-ryn'ge-al. Eclating to the 
pharynx. 
Phy-log'e-ny (Gr. phulon, stem ; 
gene, birth). The development 
by evolution of the members of 
a genus, family, order, class, or 
the animal kingdom as a whole. 
Pi'CE-ous. Pitchy; the color of 
pitch; shining reddish black. 
Pi'lose. Clothed with pile, or 
dense short down. 
Plan'u-la. The two - layered 
embryo of Coelenterates. 
Pla-typ'te KA (Gr. plains, flat ; 
pteron). The order of insects 
represented by the white ants, 
Psocidse and Pcrlidge. 
Plex'us (Lat. a knot) Applied 
to a knot-like mass of nerves 
or blood-vessels. 
Pol-lex. The thumb or inner- 
most digit of the hand or fore- 
foot. 
PoL'Y-riDE or Pol'y pite. The 
separate animals of a Hydro- 
zoon. 
Pre'o-ral. In front of the 
mouth. 
Process. A projection; used 
chiefly in osteology. 
Pro-cos'lous (Gr. pro, front; 
koilos, hollow). Those verte- 
brae concave or hollow in front. 
Proc-to DvE'um. The primitive 
hind gut, or rectum. 
Pro-tom'a-l^:. The second pair 
of head-appi ndages in Myrio- 
poda. 
Pro 'to PLASM (Gr. protos, first; 
plasma, from plasso, I mould). 
The albuminous, elementary- 
matter forming cells and the 
body substance of Protozoa. 
Prox'i mal (Lni. proximus, next). 
The fixed end of a limb, bone, 
or appendage; that nearest the 
body; opposed to distal, the 
farther end. 
Pseu-do-po'di-a (Gr. psevdes, 
false; podes, feet). The tem- 
porary processes sent out from 
the bodies of Protozoa. 
Pter-op'o-da (Gr pteron, wing; 
pous,podos, foot). A class of 
pelagic mollusks. 
Pu bes cent. Coated with very 
fine hairs. 
Punc tured. Marked with nu- 
merous small impressed dots. 
Pu'PA (Lat. a doll). The third 
or usually quiescent, chrj'salis 
stage of insects. 
Py-lo'rus. The valve between 
the stomach and intestine. 
Rat'i t^ (Lat. ratis, a raft). A 
division of birds with a keel 
less, raft- or punt like sternum. 
Rhab'di TES. The blade-like ele- 
ments of the sting and oviposi- 
tor of insects. 
Rhi zo'po DA (Gr. 7'iza, root; 
pous, podos, foot). The root 
footed Protozoa, 
