102 GLOSSARY. 



Pe'diform (L. pes,pedis, a foot ; formis, shape). Foot-like. 



Pedipal'pi (L. pes, pedis, a foot ; palpo, I touch). The name 

 given to the large chelate limbs in the Arthrogastra. 



Pedun'cle (L. pediculus, diminutive of pes, a stalk). A stalk or 

 stem. Applied to the muscular stalk by which the Bra- 

 chiopoda are attached ; the stem by which the barnacle 

 connects itself with wood or other objects. 



Pelargomor'phse (Gr. pelargos, a stork ; morphe, form). The 

 storks, a group of birds. 



Pel'vis (L. a basin). The cavity formed by the bony arch, or 

 pelvic girdle, which gives attachment to the posterior limbs 

 of vertebrated animals. 



Penicil'lium (L. penidllum, a painter's brush). -A kind of 

 fungus popularly known as "green mould/' so named from 

 the brush-like appearance of its aerial hyphae. 



Pe'nis (Latin). The male copulatory organ. 



Pen'nae (L. penna, a feather). The contour feathers of birds. 



Pennoplu'mae (L. penna, a feather; pluma, down). A term 

 applied to the small feathers or "down" of birds, also 

 termed plumulcz. 



Pentasto'mida (Gr. pente, five ; sterna, stomatos, a mouth, open- 

 ing). A group of parasitic Arthropoda. 



Pentodac'tyle (Gr. pente, five ; daktulos, a finger). Having five 

 digits. 



Pep'sin (Gr. pesso or pepto, I cook, digest). The nitrogenous 

 essential principle of the gastric juice. 



Pep'tic (Gr. pesso or pepto, I cook, digest). The name 

 sometimes given to the glands of the stomach which 

 secrete the gastric juice, more commonly termed gastric 

 glands. 



Pep'tone (Gr. pesso or pepto, I cook, digest). The term applied 

 to a nitrogenous substance after it has been rendered fit 

 for absorption by the action of the gastric juice. 



PerennTbran'chiate (L. perennis, lasting, durable ; Gr. branchia, 

 a gill). Possessing durable gills. Applied to those Am- 

 phibia in which the gills persist throughout life. 



Pericar'dium (Gr. peri, around; kardia, the heart). The 

 serous sac in which the heart is enclosed. In the Crustacea, 

 &c., the chamber which contains the heart. 



Perichon'drium (Gr. peri, around ; chondros, gristle). The 

 sheath of connective tissue which covers the cartilages. 



Pericra'nium (Gr. peri, around ; kranion, the skull). The 

 region around the skull. 



