INDEX. 



Acipenser sturio, 102, 129, 287. 



Acrania, 17, 46. 



AGASSIZ, A., 250, 251, 256. 



ALLMAN, 262. 



Ammoccetes, 163-170, 173, 178, 182, 186, 



282. 



ANDREWS, 39, 41. 

 Annelid theory, 5, 79, 82, 97, 176, 282, 



290, 293. 

 Annelids, excretory system of, 78-82, 99. 



giant fibres of, 97, 103. 



nervous system of, 95-97. 



segmentation of, 4. 



vascular system of, 55. 

 Antedon rosacea, 256, 268-269, 271. 

 Anus, 14, 25, 118, 131, 187. 

 Aorta, dorsal, 49, 50, 53. 

 Aperture, buccal, 182. 



cloacal, 182, 183, 210. 

 Appendicularia, 180, 236-239, 241, 277. 

 Archenteron, no. 

 Artery, branchial, 47, 50, 98, 139. 



genital, 98. 

 Ascidians, pelagic, 181, 236. 



sessile, 181. 



Asterias vulgaris, 254, 270. 

 Asterina gibbosa, 270, 271. 

 Asymmetron lucayanum, 40, 41. 

 Asymmetry, 155-162, 177. 

 Atriopore, 14, 77, 105. 

 Atrium (see also Cavity, peribranchial), 

 14, 22, 186, 195. 



development of, 75-78, 210-212. 



post-atrioporal extension of, 25. 

 Audition, 44. 

 AUDOUIN, 197. 



Auricularia, 251-253, 256, 268. 

 Axis (see Relations, axial). 

 AYERS, 18, 173. 



Balancers, 42. 



Balanoglossus, 29, 43, 98, 128, 221, 222, 



231, 242-253, 259, 261, 264, 265, 



274, 276. 



Balanoglossus, nervous system of, 244- 

 246. 



Kowalevskii, 248, 250. 



Kupfferi, 248, 253. 

 BALFOUR, 5, 38, 79, 175, 190, 203, 273, 



283, 292. 

 Band, adoral ciliated, 250. 



circumoral ciliated, 251, 256. 



longitudinal ciliated, 251. 



post-oral (circular) ciliated, 251, 256. 

 Bands, mesodermic, 120, 217, 218. 



peripharyngeal, 34, 140, 145, 168-169, 



179, 185, 195, 226. 

 Bars, branchial (see Gill-bars). 

 BATESON, 98, 221, 244, 245, 250, 259, 



263, 291. 



Batrachus tau, 281. 

 Bdellostoma, 173, 285. 

 BEARD, 208, 281, 292. 

 BEDDARD, 81. 

 VAN BENEDEN, 187, 191, 197, 200, 224, 



291. 



BENHAM, 33, 42. 

 BERT, 174. 

 Bipinnaria, 251. 

 Blastocoel, 108, 254, 255. 

 Blastomeres, 107. 

 Blastopore, no, 112, 197. 

 Blastula, 108, 197. 

 Blood-sinuses, 191, 192. 

 Blood-vessels, contractile, 47, 98. 



origin of, 122. 

 Bodies, polar, 106. 

 Body, pineal, 207. 



pitituary (see Hypophysis). 

 Body-cavity (see also Coelom), 217, 220- 

 222, 247. 



prceoral, 128, 218. 

 Bojanus, organ of, 194. 

 Botryllus, 181, 240. 

 BOULENGER, 14. 



BOURNE, A. G., 81. 



BOVERI, 42, 48, 60, 98, 99, loo, 151, 177. 



Brachiolarui, 270. 



