362 INDEX-GLOSSARY. 



B 



Backbone. See Vertebral Column. 



Bacteria, 58. 



Balanoglossus, 341. 



Bali, 350. 



Banca, 352. 



Barb, in the feather One of the lateral appendages of the shaft, 231. 



Barbule, in the feather One of the lateral appendages of a barb, 231. 



Basipterygium (basis, the base ; Tn-fpuytov, a fin), 160. 



Bats, 346, 356. 



Bell-animalcule = Vorticella, q.v. 



Bile The secretion of the liver, 160, 161, 191, 194. 



Bile-duct, 94, 126, 160, 191. 



Bilharzia, 39. 



Biogenesis (/3tos, life ; yeveais, birth) The production of life from life, 7. 



Bivalve, 79. 



Black Sea, 349. 



Bladder, Gall b., 160, 191 ; Urinary, 99, 205, 267, 295, 316, 333. 



Bladder-worm, 44. 



Blastoccele (jtfXao-ros, a germ ; /anXos, hollow) The cavity of the blasto- 



sphere (segmentation cavity), 27, 67, 147, 224, 257. 

 Blastoderm (/3\ao-To ; oepjua, the skin), in Meroblastic Ova The cellular 



patch resulting from segmentation, 105. 

 Blastomeres (/3Xao-To ; jue/)o?, a part) Cells resulting from the cleavage of 



the oosperm, 27. 



Blastopore (/3Xa<rr6s ; Tropos, a passage) The orifice by which the archen- 

 teron of a gastrula communicates with the exterior, 68, 70, 106, 148, 

 224, 260. 

 Blastosphere (/3Xacn-os ; <r<pa7pa t a sphere) A hollow blastula, 27. 



Blastula (dim. of j3Xao-Tos, a germ) The embryo at the conclusion of 

 cleavage, 27, 67, 105, 147, 224, 306. 



Blood, 95. 



Blood-corpuscles, 59, 78, 142, 166, 195, 245, 289. 



Blood-system, Lumbricus. See Circulatory System. 



Body (of vertebra). See Centrum. 



Body-cavity A space or system of spaces between the viscera and the 

 body wall, 31, 49 ; Lumbricus, 56, 71 ; Hirudo, 79. See also Ccelom. 



Body-wall Hydra, 20 ; Distoma, 28 ; Ascaris, 48. 



Bojanus, organs of, in Mollusca The kidneys, 118. 



Bone, 312. I. Cartilage b. One replacing pre-existing cartilage, 179, 

 188, 232, 271 ; Acetabular (cotyloid), 327 ; Alisphenoid, 272, 323, 325 ; 



