INDEX. 



Acipenser sturio, 102, 129, 287. 



Acrania, 17, 46. 



Agassiz, a., 250, 251, 256, 



Allman, 262. 



Ammocmtes, 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. 

 Aslerina gibbosa, 270, 271. 

 Asyviynetroii lucayanuvi, 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. 



AurUularia, 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. 

 Bairachus tau, 281. 

 Bdellostoma, 173, 285. 

 Beard, 208, 281, 292. 

 Beddard, 81. 

 VAN Beneden, 187, igi, 197, 200, 224, 



291. 

 Benham, 33, 42. 

 Bert, 174. 

 Bipinnaria, 251. 

 Blastocoel, 108, 254, 255. 

 Blastomeres, 107. 

 Blastopore, no, 112, 197. 

 Blastula, io3, 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 Ccelom), 217, 220- 

 222, 247. 



procoral, 128, 218. 

 Bojanus, organ of, 194. 

 Botryllus, 181, 240. 

 BOULENGER, I4. 



Bourne, A. G., 81. 



BOVERI, 42, 48, 60, 98, 99, 100, 151, 177. 

 Brachiolarta, 270. 



3" 



