GLOSSARY. 499 



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



hicuspid teeth. 

 Pr^-(esophageal. Situated in front of the gullet. 

 Pe^-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. 

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



the Elephants. 

 Proccelous (Gr. pro, before ; Jcoilos, hollow). Applied to vertebrae, the bodies 



of which are hollow or concave in front. 

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



Molluscs. . . 



Peosobranchiata (Gr. proson, in advance of; hragcMa, a gill). A division 



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



heart. 

 Prosoma (Gr. p>ro, before ; soma, body). The anterior part of the 



body. 

 Prothorax (Gr. ^:)ro; and thorax, chest). The anterior ring of the thorax of 



insects. 

 Protophyta (Gr. protos; and phu(07i, plant). The lowest division of plants. 

 Protoplasm (Gr. pj^otos ; and plasso, I mould). The elementary basis of 



organised tissues. Sometimes used synonymously for the "sarcode" of 



the Protozoa. 

 Protopodite (Gr. protos, first ; and potis, foot). The basal segment of the 



typical limb of a Crustacean. 

 Protozoa (Gr. protos; and zooii, animal). The lowest division of the animal 



kingdom. 

 Proximal (Lat. proximus, next). Applied to the slowly-growing, compar- 



ativelj'-fixed extremity of a limb or of an organism ; or to the end nearest 



to the trunk. 

 Psetjdopodia (Gr. p>seudos, falsity; and jjo;«, foot). The extensions of the 



body-substance which are put forth by the Ehizopoda at will, and which 



serve for locomotion and prehension. 

 Pteropoda (Gr. pteron, wing ; and ijous, foot). A class of the Mollusca which 



swim by means of fins attached near the head. 

 Ptero.sauria (Gr. pteron, wing; saura, lizard). An extinct order of Reptiles. 

 Pubis (Lat. puhes, hair). The share-bone ; one of the bones which enter into 



the composition of the pelvic arch of Vertebrates. 

 Pulmogasteropoda ( = Pulmonifera). 



PuLMONARiA. A division of AracJinida which breathe by means of pulmo- 

 nary sacs. 

 Pulmonifera (Lat. pidrno, a lung ; and /cro, I carry). The division oi Mol- 

 lusca which breathe by means of a pulmonary chamber. 

 Pulmonate. Possessing lungs. 

 Pye,iform (Lat. pyrus, a pear ; and /orm«, form). Pear-shaped. 



Quadrumana (Lat. quatuor, four ; manus, hand). The order of JIammals 

 comprising the Apes, Monkeys, Baboons, Lemurs, &c. 



Radiata (Lat. radius, a ray). Formerly applied to a large number of animals 



