532 



MOLLUSCA — BRACHIOPODA 



Spermatozoa, forms of, 136 



Sphaerium, 453 



Sphenia^ 456 



Sphenodiscus, 398 



Sphyradium, 442 



Spines, use of, 64 



8piraculum, 266, 4^4 



Spiraxis, 442 



Spirialis^ 249 



Spirifera, 468, 501, 505 ; stratigraphical 

 distribution, 507, 508, 511, 512 



Spiriferidae, 501, 505, 508 



Spiriferina, stratigrapliical distribu- 

 tion, 507, 508 



Spirobranchiata, 464 



Spirotropis, 426; radula, 218, 219 



Spirula, 247, 386, 387, 388 



Spirulirostra, 380, 386^ 388 



Spondylium, 500 



Spondylus, 2^7, 446, 450, 450; ocelli, 

 191 ; genital orifice, 242 



Spongiobranchaea, 437 



Spongiochiton, 403 



Sportella, 453 



Starfish eat oysters, 110 



Stearns, R. E. C, on tenacity of life, 38 



8tegodera, 306 



Stenochisma, 505; stratigrapliical dis- 

 tribution, 507, 508 



Stenogyra, 324, 442 ; S. decoUata, 279 ; 

 food, 34,; smell, 194 ; Goodallii, 279 ; 

 octona, sudden appearance, 47 



Stenogyridae, radula, 234 



Stenopus, 440 ; habits, 45 



iStenothyra, 415 



Stenotis, 4I6 



tStenotrema, 340, 44^ 



Stephanoceras, 399 



Stepsanoda, 358 



Stilifer, 76, 77, 79, 422 



Stiliferina, 76, 422 



Stiliger, 432 



Stilina, 76 



Stoastoma, 348-351, 410 



Stoloteuthis, 389 



Stomach, 239 



tStomatella, 4O8 



Stomatia, 4O8 



Stomatodon, 302, 417 



Strebelia, 353, 440 



Strength of Helix, 45 



Strephohasis, 417 



Strepsidura, 424 



Str-eptaxdus, 414 



Streptaxis, 302, 306, 309, 314-331, 343, 

 357-359, 440 ; variation, 87 



Streptoneura, 203, 404 



Streptosiphon, 424 



Streptostele, 329, 338, 440 



Streptostyla, 343-355, 353, 44O 



Stricklaiidia, 505 ; stratigraphical dis- 

 tribution, 507, 508 



Strigatella, 4^5 



Stringocephalidae, 506, 508 



iStringocephalus, 492, 497, 498, 500, 

 501, 506; stratigraphical distribu- 

 tion, 507, 508 



Strobila, 340, 345-353 



Strobilops, 442 



Strombidae, habits, 64 ; penis, 136 



Strombina, 423 



Strombus, 69, 200, 252, 4I8; mimick- 

 ing Conus, 69 ; operculum, 78, 269 ; 

 pearls from, 101 ; metapodium, 199 ; 

 stomach, 239 



Strophalosia, 504 ', stratigraphical dis- 

 tribution, 507, 508 



Stropheodonta, 497, 505, 508 



Strophia, 343-355, 442; S. nana, 278 



Strophochilus, 358, 441 



Strophomena, 499, 505 ; stratigraphical 

 distribution, 507, 508 



Strophomenidae, 500, 505t 508 



Strophostoma, 248, 414 



Structure of shell, 252 



Struthiolaria, 99, 4I8 ; radula, 216 



Styliola, 4S7 



Stylodonta, 339, 441 



Stylommatophora, 11,181,-^5; origin, 

 19 



Subemarginula, 406 



Submytilacea, 451 



Subularia. 422 



Subulina, 332, 352, 442 



Subulites, 420 



Succinea, 325, 327, 358, 433 ; jaw, 211 ; 

 S. putris, parasite of, 61 



Succineidae, 443 ; radula, 234 



Sudden appearance of Mollusca, 46 



Suessia, stratigraphical distribution, 

 507 



Sulphuric acid, 237 



Surcula, 426 



Sycotypus, 424 



Synaptocochlea, 4O8 



Syndosmya, 453 



Syringothyris, 500, 608 



Syrnola, 422 



Syrnolopis, 332, 333 



dystrophia, 356, 357 



Tachea,441 

 Taenioglossa, 223, 4II 

 Taheitia, 414 

 Talona, 457 

 Tanalia, 304, 417 

 Tancredia, 453 

 Tanganyicia, 332, 415 

 Tanganyika, L., fauna of, 12 

 Tanysiphon, 454 

 Taonius, 391, 391 

 Tapes, 454 

 Taste, 179 

 TebQnnophorus, 143, 340, 440 



