Tl6 GLOSSARY. 



Protover tebrae (Gr. protos, first). The rudimentary segments 

 formed in the vertebrate embryo from the medullary 

 plates, and from which the bodies of the vertebrae, spinal 

 nerve-roots, &c., are developed. 



Proventrfculus (L. pro, before; ventrtculus, the stomach). A 

 dilatation of the lower portion of the oesophagus in birds. A 

 similar enlargement of the alimentary canal in some Insecta. 



jPsalte'rimn (L. a psaltery). The third division of the stomach 

 of a ruminant, so called because when slit open longi- 

 tudinally, the folds of its mucous membrane fall apart like 

 the leaves of a book. 



/fceu'd-hse'mal (Gr. pseudos, false ; haima, blood). Applied to 

 the circulatory system of canals in the Annelida and other 

 Invertebrata. 



-Pseu'do-bran'chia (Gr. pseudos, false ; branchia, a gill). A rete 

 mirabile in the Teleostean fishes, which lies on the inner 

 side of the hyomandibular bone, and sometimes has the 

 form of a gill. 



/teeu'do-fUa'ria (Gr. pseudos, false ; L. fllum, a thread). A 

 mobile process similar to a thread-worm produced in the 

 course of the development of some Infusoria. 



Pseu'do-navicel'la (Gr. pseudos, false ; L. navicella, dim. of 

 navis, a ship). Small spindle-shaped cells formed in the 

 course of development in the Gregarinidae. 



/'seudopo'dia (Gr. pseudos, false; pous, podos, a foot). The 

 processes alternately thrust forth and withdrawn by 

 amoeboid cells. 



Pseu'doscope (Gr. pseudos, false; skopeo, I behold). An in- 

 strument by means of which hollow objects are made to 

 appear convex, and convex bodies hollow. 



.Pseudo'vary (Gr. pseudos, false ; L. ovum, an egg). In some 

 insects the organ within which the young are developed. 



/keudo'vum (Gr. pseudos, false; L. ovum, an egg). A cell 

 formed in the pseudovary of some insects, and which sub- 

 sequently developes into the larva. 



Jfeittaeomor'phse (Gr. psittakos, a parrot; morphe, form). The 

 parrots, a group of carinate birds. 



./Was ma'jor (Gr. psoa, the loins; L. major, greater). A 

 muscle passing from the posterior dorsal or lumbar 

 vertebrae to the femur. 



/Was mi'nor (Gr. psoa, the loins ; L. minor, smaller). A 

 muscle passing from the under surface of the posterior 

 dorsal or lumbar vertebrae to the ilium or pubis. 



