3i6 



INDEX. 



Sac, branchial (see also Pharynx), 183, 



195. 227. 

 Sagiita, 13, 277-278. 

 Saint-Hilaire, I, 279. 



principles of, 2, 279. 

 Salenskv, 206. 

 Salpa, iSo, 1S2, 193, 236, 241. 

 Sarcolemma, 36. 

 Sars, G. O., 262. 

 Savignv, 190. 

 Schizoccel, 175. 

 Schmidt, Karl, 182. 

 Schneider, Anton, 35, 38, 98, 100, 178. 

 Sclerotome, 123, 175, 221- 

 Sedgwick, Adam, 112, 289, 291. 

 Seeliger, 239-240, 269, 277. 

 Segmentation (see Cleavage). 

 Segmentation-cavity, 108. 

 Semon, 67. 



Semper, 5, 79, 99, 176. 

 Sense-cells, 20, 21. 

 Sense-organ of praeoral pit (see Groove 



of Hatschek). 

 Septa, 13, 37, 122. 

 Sheath, notochordal, 38, 123. 

 Sheldon, Lilian, 293. 

 Shield, buccal, 263. 

 Skeleton, axial, 13. 

 Snout, 115, 218. 

 Somites, mesodermic, 115, 121. 

 Spawning, 105. 

 Species of Amphioxus, 41. 

 Spee, Graf, 99. 



Spencer, Baldwin, 207, 208, 209. 

 Spengel. 38, 41, 248. 

 Spermatozoa. 105. 

 Spinal cord, 83, 222. 



central canal of, 89, 289. 

 Spiracle, 173. 

 Spiraculum, 23. 

 Splanchnocosl, 122. 

 Stage, critical, 149, 174. 

 Stannius, 45. 

 Stieda, 100. 

 Stigmata, 183, 195, 196, 227. 



formation of, 229-235. 

 Stomodo^um, 165, 209. 

 Sympathetic system, 35, 86. 

 Synapticula (see Cross-bars). 



Table, showing order of development of 

 Ascidian and Amphioxus, 213. 



Tadpole, Batrachian, 14. 

 Tail of Ascidian tadpole, 201-204, 212, 

 222. 



Teleosteans, 45, 281. 



Tentacles, velar, 20, 195. 



Test, 182, 240. 



Thacher. 38. 



Thymus, 29. 



Tissue, connective, 37, 41, 122. 



mesenchymatous, 221. 

 Tongue-bars, 28, 140, 142, 148, 231, 

 Tornaria, 250-253, 255-256, 270, 274. 

 Trochophore, 256, 272. 

 Tube, medullary, 114, 120, 198, 274, 



neuro-hypophysial, 225. 

 Tubercle, dorsal, 189, 225. 

 Tuberculum posterius, 102. 

 Tubules, excretory, 59-65, 72, 100, 122. 



mesonephric, 70. 177. 



pronephric, 67, 70, 78, 100. 



uriniferous, 65. 

 Tunic (see Test). 



Ureter, 66. 

 Urmund, no, 

 Ussow, 190. 



Vacuolisation of notochord, 125, 216, 



240, 244. 

 Vas deferens, 187. 

 Vein, cardinal, 54. 



caudal, 54. 



hepatic, 49, 98. 



portal. 53. 98. 



sub-intestinal, 49, 53-55. 

 Velum, 20, 50, 150, 17S. 

 Vesicle, cerebral, 90, 100, 204, 223, 224, 

 226. 



Water-pore, 253, 254. 

 Weiss, F. E., 57, 59. 



VAN WlJHE, 39. 50, 51 

 164, 165, 178, 2S9. 



Wilder, Burt G., 14. 

 Wilson. E. B,, 108, 174, 175, 292, 

 Woodward, A. S., 44. 



Yarrell, S. 



Ziegler, H. E., 175. 

 Zoarces, 67. 



99, 12S, 163. 



