1 6 GLOSSARY. 



Bile (L. lilts). The alkaline secretion of the liver. 

 Biliful'vin (bile ; fulvus, dark or reddish yellow). A yellow 



colouring matter of the bile. 

 Biliru'bin (bile; rubor, redness). A red colouring matter 



of the bile. 

 Biliver'din (Fr. bile, the bile; vert, green). A green colouring 



matter found in bile. 

 Biology (Gr. bios, life ; logos, a discourse). The science which 



treats of the nature and properties of all living, as distinct 



from not living, matter. 

 Bipolar (L. bis, twice ; polus, a pole). Having two poles; 



applied to those ganglionic nerve corpuscles which have 



two radiating processes. 

 Bisex'ual (L. bis, in two ways ; sexus, sex). Not having the 



sexes united in the same individual. 

 Bi'valve (L. bis, twice; valvce, folding doors). Having a shell 



with two valves. 

 Bi'vium (L. a place with two roads). The two posterior 



ambulacra of the Echinidea. 

 Blaste'ma (Gr. blastema, a bud, shoot). The indifferent tissue 



of the embryo. 

 Blas'tide (Gr. blastos, a germ). A small, clear space in the 



segments of the ovum, which is the precursor of the 



nucleus. 

 Blas'toccele (Gr. blastos, a. germ ; koilos, hollow). The central 



cleavage cavity of the morula produced by the segmenta- 

 tion of the holoblastic ovum. 

 Blas'toderm (Gr. blastos, a germ; derma, skin). The germinal 



membrane from which the embryo is developed. 

 Blastoi'dea (Gr. blastos, a bud; eidos, form). A group of 



extinct Crinoidea. 

 Blas'tomere (Gr. blastos, a germ; meros, a part, portion). 



The segments produced by the division of the 



ovum. 

 Blas'tosphere (Gr. blastos, a germ ; sphaira, a ball, sphere). 



The hollow sphere formed by the arrangement of the 



blastomeres on the periphery of the ovum. 

 Blas'tostyle (Gr. blastos, a bud ; stylos, a style, pen). The 



special stalk upon which the gonophores in the Hydro- 



phora are frequently developed. 

 Bo'tany (Gr. botarie, an herb). The branch of Biology which 



treats of vegetable life. 

 Bra'chial (L. brachium, the fore-arm). Relating to the arm. 



