GLOSSARY. 6^2 



PEE-EN-in-EBAN-cHi-A'TA(Lat.i)e«»m«, perpetual; Gr. tragchia, gills). Ap- 

 plied to those AnypTiaMa in wfiioh the giJls are permanently retained through- 

 out life. 



PEE-eA-MEir-TA'cEons (Lat. pergamena, parchment). Of the texture of parch- 

 ment. 



Pee-i-oae'di-um {Gr. peri, around; Teardia, heart). The serous memhrane in 

 which the heart is contained. 



Pee'i-derm (Gr. peri, around ; and derma, skin). The hard cuticular layer 

 which is developed 'bj the ccenosarc of certain of the Hyiroma,. 



Pek-i-gas'teio (Gr. prni^ around ; and gaster, stomach). T^ie perigastric space 

 13 the cavity which surrounds the stomach and other viscera, corresponding 

 to the abdominal cavity of the higher animals. 



Per-i-os'tka-oum (Gr. peri; and ostrahon, shell). The layer of epidermis 

 which covers the shell in most of the Mollusca. 



Peb'i-plast (Gr. peri; and plasto, I mould). The intercellular substance or 

 matrix in which the organized structures of a tissue are embedded. 



Peb'i-some (Gx.jperi ; and soma, body). The coriaceous or calcareous integu- 

 ment of the Eehvnodermata. 



Peb-is-so-dao'ty-la {Gr.perissos, uneven ; daktuhs, finger). Applied to those 

 Hoofed Quadrupeds ( Ungulata) in which the feet have an uneven number 

 of toes. 



Pee'i-stome (Gr. peri; and stoma, mouth). The space which intervenes be- 

 tween the moutn and the margin of the calyx in Vortioella ; also the space 

 between the mouth and tte tentacles in a sea-anemone (Actinia) ; also the 

 lip or margin of the mouth of a univalve shell. 



Pee-i-vis'oe-eal (Gr. peri ; and Lat. viscera, the internal organs). Applied 

 to the space surrounding the viscera. 



Pet'a-loid. Shaped like the petal of a flower. 



Pha-lan'oes (Gr. phalagx, a row). The small bones composing the digits of 

 the higher Vertehrata. Normally each digit has three phalanges. 



Phae-tw-oo-bean'chi-i (Gt. pharugx, pharynx; bragchia,gi\ls.). The order 

 of Fishes comprising only the Lancelot. 



Phab'tux. The dilated commencement of the gullet. 



Pheas'ma-cone (Gr. pTiraqma, a partition ; and horws, a- cone). The cham- 

 bered portion of the internal shell of a mlemnite. 



Pht-lac-to-ljsm'a-^a (Gr. phulasso, I guard ; and lai/mos, throat). The divi- 

 sion of Polyma in which the mouth is provided with the arched valvular 

 process known as the " epistome." 



Phyl'lo-otsts (Gr. «A«Zfo?i, leaf ; andJasiis, a cyst). The cavities in the in- 

 terior of the " hydrophyllia " of certain of the Oceanic Hydrozoa. 



Phtl-lop'o-da {Gr. phutlon, leaf; &uA.pou8, foot). An order of Crustacea, 



Pht-o-gem-ma'ei-a (Gr. «Amo, I produce ; and Lat. gemma, bud). The small 

 gonoblastidia of Velelta, one of the Physophoridce. 



PHT-so-aBA'DA (Gr. plmsa, bellows or air-bladder ; and Lat. gradior, I walk). 

 Applied formerly to the PhysopTmridce, an order of Oceanic Hydrozoa, in 

 which a " float " is present. 



PHT-so-PHOE'i-D.fi (Gr. phusu, air-bladder ; and^Ao-o, I carry). An order of 

 Oceanic Hydrozoa. 



Pht'toid (Gr. pTaiton, a plant ; and eidos, form). Plant-like. 



PHY-TOPH'A-aous (Gr. pliuton, a plant ; and phago, I eat). Plant-eating, or " 

 herbivorous. 



Piir'N^. 



Pih'kate (Lat. pinna, a feather). Feather-shaped, or possessing lateral pro- 

 cesses. 



Pin-ni-gp^'da (Lat.^i/ma, a feather; gradmr, I walk). The group of Oar- 

 ni-vora, comprising the Seals and Wall-uses, adapted for aquatic lite. Often 

 called Pinniped i.a. 



Pr[f'ND-L.E (Lat. dim. of_pi»«a.) The lateral processes of the arms ot Ui-i- 



Pis'oES (Lat. pisds, a fish). The class of Vertebrates comprising the Fishes. 

 PiA-OEw'TA (Lat. for a cake.) The " after-birth," or the organ by which a 



