GLOSSARY. 343 



Peb-ek-ni-bean-ohi-a'ta (LaX. perermis, perpetual ; Gr. h-agcTda, gills). Ap- 

 plied to those Amphibia in wmch the gills are permanently retained througn- 

 out life. 



PEE-SA-jiEN-TA'oEons (Lat. pergamena, parchment). Of the texture of parch- 

 ment. 



Peb-i-oae'di-dm {dr. peri, around; Tcardia, heart). The serous membrane in 

 which the heart is contained. 



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

 which is developed hy the coenosaro of certain of the Sydrozoa. 



Pek-i-gas'tbio (Gr. peri, around ; and gaster, stomach). The perigastric space 

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

 to the abdominal cavity of the higher animals. 



Peb-i-os'tba-cum (Gr. peri; and oetrahon, shell). The layer of epidermis 

 which covers the shell in most of the MoUusca. 



Per'i-plast {dr. peri; and plasso, I mould). The intercellular substance or 

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



Peb'i-some (Gr^eri ; andsoma, body). The coriaceous or calcareous integu- 

 ment of the MeMnodenmata. 



Peb-is-so-dao'tt-la (Qr.perissos, uneven ; daHulos, finger). Applied to those 

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

 of toes. 



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

 tween the mouth and the margin of the calyx in Vorticella ; also the space 

 between the mouth and the tentacles in a sea-anemone (^Aelinia) ; also the 

 lip or margin of the mouth of a univalve shell. 



Peb-i-vis'ce-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-las'qes (Gr. plialagx, a row). The small bones composing the digits of 

 the higher Vertebraia. Normally each digit has three phalanges. 



Phae-tn-oo-beau'ohi-i (Gr. pharugx, pharynx; hragchm, gills). The order 

 of Fishes comprising only the Lancelot. 



Phae'ynx. The dilated commencement of the gullet. 



Pheag'ma-oone (Gr. pliragma, a partition ; and honos, a cone). The cham- 

 bered portion of the internal shell of a Belemnite. 



PHT-LAO^o-i^M'AyrA (Gr. phulasso, I guard ;■ and lavmos, throat). The divi- 

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

 process known as the " epistome." 



Phye'lo-otsts (Qr. phullon, leaf; andfewiSis, a cyst). The cavities in the in- 

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



Phvl-lop'o-da {Qt. pjiuiton, leaf; anApous, foot). An order of Orudacea. 



PHr-o-GEM-MA'Ri-A (Gr. phuo, I produce ; and Lat. gemma, bud). The small 

 gonoblastidia of VeUlla, one of the PhysopJwridce. 



Pht-so-oea'da (Gr. pTvusa, bellows or air-bladder ; and Lat. gradior, I walk). 

 Applied formerly to the PJiyaoplwridce, an order of Oceanic Sydrozoa, in 

 which a " float " is present. 



Phy-so-phoe'i-d^ (Gr.^AKsa, air-bladder; &niphero, I carry). An order of 

 Oceanic Sydrozoa. 



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



PnY<ropH'A-aous (Gr. phuton, a plant ; and pkago, I eat). Plant-eating, or 

 herbivorous. 



Pin'n^. 



I'in'nate (Lat. pinna, a feather). Feather-shaped, or possessing lateral pro- 

 cesses. 



Pin-ni-gea'da (Lat. pinna, a feather; gradior, 1 walk). The group of Car- 

 nivora, comprising the Seals and Walruses, adapted for aquatic life. Often 

 called Pinmpedia. 



Pin'nu-l^ (Lat. dim. of^mna.) The lateral processes of the arms ot Ori- 

 noids, 



Pis'oBS (Lat. mma, a flsh). The class of Vertebrates comprising the Fishes. 



Pla-oen'ta (Lat. lor a cake.) The " after-birth," or the organ by which a 



