INDEX. 



615 



Scirtopoda, 310. 

 Scissurella, 361, 394. 

 Sciurella, 133. 

 Scleranthelia, 178. 

 Scleraxonia, 182. 

 Sclerisis, 182. 

 Scleritoderma, 94. 

 Sclerobelemnon, 181. 

 Scleroblast, 81. 

 Sclerocheilus, 489. 

 Sclerogorgidae, 182. 

 Sclerohelia, 195. 

 Scleronephthya, 179. 

 Scleroplegma, 93. 

 Scleroptilum, 181. 

 Sclerostornuni, 235, 280. 

 Sclerothamnus, 93. 

 Sclerotiura, 15. 

 Scoleciformia, 487. 

 Scolecolepis, 483. 

 Scolex, 251, 253. 

 Scollops, 347. 

 Scolopes, 97. 

 Scoloplos, 482. 

 Scopula, 92. 

 Scorpion-shell, 399. 

 Scrobicularia, 347. 

 Scruparia, 564. 

 Scrupocellaria, 565. 

 Scurria, 394. 

 Scutibranchia, 393. 

 Scutum, 395. 

 Scutus, 395. 

 Scyllaea, 412. 

 Scyphidia, 51. 

 Scyphistoma, 107. 

 Scyphomedusae,157, 162. 

 Scypho-j)olyp, 107. 

 Scytalium, 181. 

 Scytophorus, 189. 

 Sea-anemone, 183. 

 Sea- hare, 407. 

 Sea-mouse, 478. 

 Secondary mesentery, 



184 ; symmetry in 



Gastropods, 385. 

 Seison, 304, 310. 

 Seisonacea, 310. 

 Selcnaria, 566. 

 Semantis, 23. 

 Semele, 347. 

 Semostomae, 167. 

 Semperella, 92. 

 Semperina, 182. 

 Senescence, 43. 

 Sense cells, 100. 

 Sense-organs Medusae, 



115. 

 Sepia, 417, 439, 440, 441, 



445. 

 Sepiadariidae, 445. 



Sepiola, 445. 

 Sepiostaire, 425. 

 Sepioteuthis, 445. 

 Septa, 112 ; of corals, 



192. 



Septaria, 395. 

 Septata, 59. 

 Septibranchiata, 344. 

 Serialaria, 552. 

 Seriatopora, 195. 

 Serpula, 491. 

 Serosporidia, 69. 

 Sertularia, 133. 

 Setae, 447. 

 Setidiura, 95. 

 Setosella, 565. 

 Sexual reproduction, 71. 

 Shell of Cephalopoda, 



424 ; Gastropoda, 358. 

 Shell-gland of Gastro- 

 poda, 381. 

 Shepherdella, 13. 

 Shipworm, 349. 

 Sicyonis, 188. 

 Sideractis, 188 

 Siderastraea, 196. 

 Sideroderma, 96. 

 Sigalion, 478. 

 Sigaretus, 361, 397. 

 Sigma, 84. 

 Sigmatella, 98. 

 Sigmatophora, 93. 

 Silenia, 349. 

 Silicoflagellata, 35. 

 Siliquaria, 399. 

 Silkworm disease, 64, 68. 

 Sinistral shell, 360. 

 Sinupalliatae, 326. 

 Sinuses of Hirudinea, 



517. 

 Siphon, 138, 139; of 



of Echiuroidea, 530 ; 



of Gastropoda, 358 ; 



Lamellibranch, 328 ; 



of Nautilus, 424. 

 Siphonactinia, 188. 

 Siphonanthae, 144. 

 Siphonaria, 362, 375, 



379, 414, 415. 

 Siphonicytara, 565. 

 Siphonidium, 94. 

 Siphonochalina, 96. 

 Siphonodentalium, 352. 

 Siphonogaster, 511. 

 Siphonoglyphe, 104; 



Alcyonaria, 177. 

 Siphonogorgia, 179. 

 Siphonophora, 137. 

 Siphonostoma, 462, 489. 

 Siphonostomata, 360. 

 Siphonostomatous, 361. 



Siphonozooid, 177. 



Siphonula; 144, 148. 



Siphoptychium, 17. 



Siphosome, 139. 



Sipunculoidea, 534. 



Sipunculus, 536, 5S9. 



Six-hooked embryo, 251. 



Skeleton of sponge, 80. 



Skenea, 398. 



Slavina, 509. 



Sleeping sickness, 289. 



Slit, 361. 



Slug, 416. 



Smaragdia, 395. 



Smaragdinella, 406. 



Smilotrochus, 194. 



Smittia, 566. 



Solarium, 361, 396. 



Solen, 328, 331, 333, 

 336, 348. 



Solenastraea, 196. 



Solenocaulon, 182. 



Solenoconchae, 349. 



Solenocurtus, 348. 



Solenogastres, 352. 



Solenomya, 331, 337, 

 341, 345. 



Solenopharynx, 220. 



Solenophorus, 256. 



Solenophrya, 53. 



Solenosmilia, 195. 



Sollasella, 97. 



Solmaris, 137. 



Solmissus, 137. 



Solmoneta, 137. 



Solmundella, 137. 



Solmundus, 137. 



Somatocyst, 145. 



Somite, 453. 



Sorocelis, 221. 



Sorophora, 17. 



Sorosphaera, 13. 



Sosane, 486. 



Spadella, 591. 



Spadix of Nautilus, 421. 



Sparganophilus, 511 . 



Spathidium, 45. 



Sperm injection, 217,227, 

 249 ; sacof Oligochaeta, 

 503 ; reservoir of Oli- 

 gochaeta, 503. 



Spermatheca of Oligo- 

 chaeta, 505. 



Spermatophore of Cepha- 

 lopoda, 440. 



Spermatophores of Hiru- 

 dinea, 523; of Nautilus, 

 421 ; of Oligochaeta, 

 505, 507. 



Spermatozoon, 70. 



Spermiducal gland, 504. 



