GLOSSARY. 115 



ProtamoeTba (Or. protos, first ; amoibe, change). A low form of 



the Monera, which is constantly changing its form by 



sending out and withdrawing pseudopodia. 

 Pro'teid (Gr. protos, first). Applied to amorphous nitrogenous 



substances, as albumen, globulin, &c. 

 Protei'dea (Gr. protos, ; first; eidos, shape). A group of the 



Amphibia. 

 Pro'tein (Gr. protos, first). A nitrogenous substance analogous 



to fibrin, and erroneously supposed by Mulder to form the 



substance from which all albuminoids were derived. 

 Proteoly'tic (Gr. protos, first ; luo, I loose). Converting food 



material into protein. 

 Proterogly'phia (Gr. proteros, before; glitpho, I carve). A 



group of snakes having the anterior maxillary teeth 



grooved. 



Prothal'lium ") (Gr. pro, before ; thallos, a young shoot). The 

 Proth.al.lus j green, leaf-like, cellular expansion which grows 



from the spore of a fern. 

 Protho'rax (Gr. pro, before; tJiorax, the chest). The first 



somite of the thorax in the Insecta. 

 Protococ'cus (Gr. protos, first ; kokkos, a berry). A microscopic 



vegetable organism which forms the green scum upon 



tiles, trunks of trees, &c. 

 Protogas'tric (Gr. protos, first; gaster, a stomach). A name 



given to two of the subdivisions of the gastric lobe of the 



carapace in the Brachyura. 

 Protoge'nes (Gr. protos, first ; gennao, I produce). A low form 



of the Monera. 

 Pro'toplasm (Gr. protos, first ; plasma, from plasso, to shape, 



mould). A nitrogenous substance, possessing so-called 



" vital" properties, and which is an essential constituent 



of all living beings, the lowest organisms consisting of 



simple protoplasm, the tissues of the highest being formed 



of differentiated protoplasm. 

 Protoplas'ta (Gr. protos, first ; plastos, formed, moulded). A 



group of the Protozoa. 

 Proto'podite (Gr. protos, first ; potts, podos, a foot). The basal 



division of a typical abdominal segment in the Crustacea. 

 Protorosau'ria (Gr. proteros, first; sauros, a lizard). A group 



of the Lacertilia, which comprises the oldest known 



Sauropsida. 

 Protoso'mites (Gr. protos, first ; soma, somatos, a body). The 



rudimentary body-segments in the embryo of the Polychseta. 



