6;6 



GLOSSARY. 



TOLYPIDE. The separate zooid of a Polyzoon. 



POLYPIDOM. The dermal system of a colony of a Hydrozoon, or Polyzoon. 



POLYPITE. The separate zooid of a Hydrozoon. 



POLYSTOME (Gr. polus, many ; and stoma, mouth). Having many mouths ; 



applied to the Acinetce amongst the Protozoa. 

 POLYTHALAMOUS (Gr. polus ; and thalamos, chamber). Having many chani 



bers ; applied to the shells of Fomminifera and Cephalopoda. 

 POLYZOA (Gr. polus ; and zob'n, animal). A division of the Molluscoida, com- 

 prising compound animals, such as the Sea-mat. Sometimes called Bryozoa. 

 POLYZOARIUM. The dermal system of the colony of a Polyzoon (= Polypi - 



dom). 



POKCELLANOUS. Of the texture of porcelain. 



PORIFERA (Lat. porus, a pore ; and/ero, I carry). Sometimes used to desig- 

 nate the JForaminifcra, or the Sponges. 

 POST-ANAL. Situated behind the anus. 

 POST-(ESOPHAGEAL. Situated behind the gullet. 

 POST-ORAL. Situated behind the mouth. 

 PR^E-MAXILL^E. (See Intermaxillse). 



PR^EMOLARS (Lat. prce, before ; molares, the grinders). The molar teeth of 

 Mammals which succeed the molars of the milk-set of teeth. lu man, the 

 bicuspid teeth. 



PRjE-(ESOPHAGEAL. Situated in front of the gullet. 



PR^E-STERNUM. The anterior portion of the breast-bone, corresponding with 

 the manubrium sterni of human anatomy, and extending as far as the point 

 of articulation of the second rib. 

 PRESSIROSTRES (Lat. pressus, compressed; rostrum, beak). A group of the 



Grallatorial Birds. 

 PROBOSCIDEA (Lat. proboscis, the snout). The order of Mammals comprising 



the Elephants. 



PROBOSCIS (Lat. or Gr. the snout). Applied to the spiral trunk of Lepido}>- 

 terous Insects, to the projecting mouth of certain Crinoids, and to the cen- 

 tral polypite in the Medusce. 

 PROCCELOUS (Gr. pro, before ; koilos, hollow). Applied to vertebrae, the bodies 



of which are hollow or concave in front. 

 PROGLOTTIS (Gr. for the tip of the tongue). The generative segment or joint 



of a Tape-worm. 



PRO-LEGS. The false abdominal feet of Caterpillars. 

 PRONATION (Lat. pronus, lying on the face, proue). The act of turning the 



palm of the hand downwards. 

 PROPODIUM (Gr. pro, before ; pous, foot). The anterior part of the foot in 



Molluscs. 

 PROSCOLEX (Gr. pro, before ; scolex, worm). The first embryonic stage of u 



Tape-worm. 



PROSOBRANCHIATA (Gr. proson, in advance of ; bragchia, a gill). A division 

 of Gasteropodous Molluscs in which the gills are situated in advance of the 

 heart. 



PROSOMA (Gr. pro, before ; soma, body). The anterior part of the body. 

 PROTHORAX (Gr. pro ; and thorax, chest). The anterior ring of the thorax of 



insects. 



PROTOPHYTA (Gr. protos; and phuton, plant). The lowest division of plants. 

 PROTOPLASM (Gr. protos/ &ndplasso, 1 mould). The elementary basis of or- 

 ganised tissues. Sometimes used synonymously for the " sarcoid " of the 

 Protozoa. 

 PROTOPODITE (Gr. protos, first ; and pous, foot). The basal segment of the 



typical limb of a Crustacean. 

 PROTOZOA (Gr. protos; and zoon, animal). The lowest division of the animal 



kingdom. 

 PROVENTRICULUS (Lat. pro, in front of ; ventriculus, dim. of venter, belly). 



The cardiac portion of the stomach of Birds. 



PROXIMAL (Lat. proximus, next). The slowly-growing, comparatively-fixed 

 extremity of a limb or of an organism. 



