(Lat. pecten, a comb). Comb-like; applied to the gills of certain Gasteropods, hence called Pectinibranchiata.
(Lat. pectus, chest). Connected with, or placed upon, the chest.
(Lat. perennis, perpetual; Gr. bragchia, gill). Applied to those Amphibia in which the gills are permanently retained throughout life.
(Lat. pes, the foot). Connected with the foot of the Mollusca.
(Lat. pedicellus, a louse). Certain singular appendages found in many Echinoderms, attached to the surface of the body, and resembling a little beak or forceps supported on a stalk.
(Lat. dim. of pes, the foot). A little stem.
(Lat. pes, foot; and palpo, I feel). An order of Arachnida comprising the Scorpions, etc.
(Lat. pedunculus, a stem or stalk). In a restricted sense applied to the muscular process by which certain Brachiopods are attached, and to the stem which bears the body (capitulum) in Barnacles.
Possessing a peduncle.
(Gr. pelagos, sea). Inhabiting the open ocean.
(Gr. pelekus, an axe; podes, feet). A name often applied to the Lamellibranchiata, on account of many of them having a hatchet-shaped or sickle-shaped foot.
(Lat. pergamena, parchment). Of the texture of parchment.
(Gr. peri, around; kardia, heart). The serous membrane in which the heart is contained.
(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.
(Gr. peri; and ostrakon, shell). The layer of epidermis which covers the shell in most of the Mollusca.
(Gr. peri; and plasso, I mould). The intercellular substance or matrix in which the organised structures of a tissue are embedded.
(Gr. peri, around; sarx, flesh). Employed by Prof. Allman as a general term for the chitinous envelope secreted by many of the Hydrozoa.
(Gr. perissos, uneven ; daktulos, finger). Applied to those Hoofed Quadrupeds (Ungulata) in which the feet have an uneven number of toes.
(Gr. peri; and stoma, mouth). The space which intervenes between the mouth and the margin of the calyx in Vorticella ; also the space between the mouth and the tentacles in a sea-anemone (Actinia); also the lip or margin of the mouth of a univalve shell.