I 



SUBJECTS INDEX 



473 



Ehopalura, 206, 207. 



Giardii, 206. 



Iiitoshii, 206. 



ophiocoruffi, 206. 

 Bhynchelmis, 281, 282, 284, 286, 



291, 299, 300. 

 Ehynchobdellidee, 319. 

 Einalda, 34. 

 Eotatoria, 256. 



relationships of, 259. 

 Eumpfkeim (Hirudinea), 329. 



Sabella, 3, 263. 

 Sabellaria, 263, 276. 

 SaccociiTus, 290. 

 Sagitta, 367. 

 Sarsia prolifera, 72. 



siphonophora, 72. 

 Scbizocladium, 49. 

 Schizostomnm, 175. 

 Sclerodermata, 100. 

 Sclerogorgia. 83. 

 Scolex (Tseniadse), 197. 

 Scyphistoma, 104, 105, 110. 

 Scyphomedusae, 39, 102, 103, 122. 

 Scyphopolyps, 103. 

 Scyphozoa, 124. 

 Scyphula, 125. 

 Sedentaria, segmental appendages 



of, 279. 

 SemsBostomae, 124. 

 Sexual reproduction, 2. 

 Silicea, 22. 



Siphonophora, 39, 59. 

 Siphonula, 65, 70. 

 Sipunculidae, 357, 365.. 



relationships of, to Annelida, 

 365. 

 Sipuneulus, 357. 



larva of, compared to Trocho- 

 phore, 361. 

 Somatic mesoderm, see Mesoderm, 



somatic. 

 Spatangus, 424. 



Sphserechinus, cleavage in, 398. 

 SphEBrosyllis, 262. 

 Spheerularia, 240. 

 Spio, 276, 278. 

 Spiroptera, 238, 243. 

 Spirorbis, 279. 



Pagenstecheri, 262. 



spirillum, 262. 

 Splanchnic mesoderm, see Meso- 

 derm, splanchnic. 

 Spongelia, 23. 

 Spougicola, 113. 



Spongilla, 25, 27, 34. 



Spongioblasts. 32. 



Sporocyst (Distomidea), 181. 



Soorogonia, 59. 



Sporophores, 47. 



Sporosacs, 39. 



Sprouting (Porifera), 28. 



Stelospougia, 28. 



Stephalia, 62. 



Sfephanomia, 60, 



Stephanoscyphus, 103. 



Sternaspis, 273. 



Sterroblastula, 7. 



Sterrogastrula, see Gastrula, epi- 



bolic. 

 Stock, 1. 



Stomobrachium, 49. 

 Strobila, 104, 113. 114. 

 Strongylocentrotus, cleavage in, 

 398. 



metamorphosis of, 439. 

 Stylasteridse, 53. 

 Stvlochopsis, 168. 

 Stylochus, 162, 164, 167, 168. 

 St\lodrilus, 299. 

 Stylorhiza, 121. 

 Sycandra, 14. 

 Sycou, 19. 

 Sycyonis, 93. 

 Syllidae, nonsexual reproduction 



of, 302, 304. 

 Syllis ramosa, 304. 



resemblance of larva to Dino- 

 philus, 313. 



vivipara, 262. 

 Sympageiia, 33. 

 Sympodiiim, 76, 77. 

 Synapta, 398. 



cleavage in, 392. 



mesenchyma, 396, 397, 404, 

 456. 



metamorphosis of ciliated 

 band, 430. 



nerve-ring of. 427. 



vasoperitoneal vesicle of, 409. 



Taenia coenurus, 197, 200. 



cucumerina, 193. 



echinococous, 200. 



saginata (Fig. 96), 196. 



serrata, 193. 



solium, 198. 



tailed cysticerci of, 196. 

 Teeuiadee, 193. 



embryonal membranes of, 194. 

 Telepsavus, 274, 316. 



