SUBJECTS INDEX 



473 



Ehopalura, 206, 207. 



Giardii, 206. 



lutoshii, 206. 



ophiocoruffi, 206. 

 Ehynchelmis, 281, 282, 284, 286, 



291, 299, 300. 

 Ehvnchobdellidsa, 319. 

 Einalda, 34. 

 Eotatoria, 2-56. 



relatiousliips of, 2.59. 

 Eumpfkeim (Hirudinea), 329. 



Sabella, 3, 263. 



Sabellaria, 263, 276. 



SaccociiTus, 290. 



Sagitta, 367. 



Sarsia prolifera, 72. 

 siphonophora, 72. 



Scbizocladium, 49. 



Sc.bizostomum, 17-5. 



Scleiodermata, 100. 



Sclerogorgia, 83. 



Scolex (Tffiniadffi), 197. 



Scyphistoma, 104, 105, 110. 



Seypbomedusffi, 39, 102, 103, 122. 



Scyijbopolyps, 103. 



Scyphozoa, 124. 



Scyphula, 125. 



Sedeutaria, segmental appendages 

 of, 279. 



SemEeostomae, 124. 



Sexual reproduction, 2. 



Silicea, 22. 



Sipbouophora, 39, 59. 



Siphonula, 65, 70. 



Sipunculidfe, 357, 365.. 



relationsbips of, to Annelida, 

 365. 



Sipunculus, 357. 



larva of, compared to Trocbo- 

 phore, 361. 



Somatic mesoderm, see Mesoderm, 

 somatic. 



Spatangus, 424. 



Spbaarechinus, cleavage in, 398. 



Spbserosyllis, 262. 



Spbffirularia, 240. 



Spio, 276, 278. 



Spiroptera, 238, 243. 



Spirorbis, 279. 



Pagenstecberi, 262. 

 spirillum, 262. 



Splanchnic mesoderm, see Meso- 

 derm, splanchnic. 



Spongelia, 23. 



Spougicola, 113. 



Spongilla, 25, 27, 34. 



Spongioblasts, 32. 



Sporocyst (Distomidse), 181. 



Si'orogouia, 59. 



Sporophores, 47. 



Sporosacs, 39. 



Sprouting (Porifera), 28. 



Stelospougia, 28. 



Stephalia, 62. 



Stei^hanomia, 60. 



Stephanoscyplius, 103. 



Sternaspis, 273. 



Sterroblastula, 7. 



Sterrogastrula, see Gastrula, epi- 



bolic. 

 Stock, 1. 



Stomobracbium, 49. 

 Strobila, 104, 113, 114. 

 Strongylocentrotus, cleavage in, 

 398. 



metamorphosis of, 439. 

 Stylasteridse, 53. 

 Stvlochopsis, 168. 

 Stylocbus, 162, 164, 167, 168. 

 St\lodrilus, 299. 

 Stylorbiza, 121. 

 Sycandra, 14. 

 Sycou. 19. 

 Syoyonis, 93. 

 Syllidffi, nonsexual reproduction 



of, 302, 304. 

 Syllis ramosa, 304. 



resemblance of larva to Dino- 

 philus, 313. 



vivipara, 262. 

 Sympagella, 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. 



echiuococcus, 200. 



saginata (Fig. 96), 196. 



serrata, 193. 



solium, 198. 



tailed cvsticerci of, 196. 

 Tasuiadee, 193. 



embryonal membranes of, 194. 

 Telepsavus, 274, 316. 



