354 
$$$ 
Solenotellina, 273 
Solidula, 168 
Spadix, 323 
Spatha, 268 
Spekia, 154 
Spermatophore, 128, 323 
Sphaenia, 273 
Sphaerium, 267 
Sphyradiun, 188 
Spicula, 42 
Spinigera, 155 
Spira, 81 
Spiraculum, 152 
Spirotropis, 91 
Spirula, 338 
Spirulirostra, 337 
Spondylus, 262 
Spongiobranchaed, 173 
Spongiochiton, 53 
Sportella, 266 
Standella, 274 
Stavelia, 259 
Stenoglossa, 163 
Stenogyra, 188 
Stenoplax, 58 
Stenoradsia, 53 
Stenothyra, 154 
Stephanoceras, 336 
Stiliger, 181 
Stiva, 153 
Stoastoma, 150 
Stoloteuthis, 342 
Stomatella, 149 
Stomatia, 149 
Straparollina, 147 
Straparollus, 147 
Strepsidura, 164 
Streptaxis, 189 
Streptoceras, 333 
Streptoneura, 142 
Streptostyla, 189 
Strombus, 155 
Strophia, 188 
Strophomenia, 60 
Struthiolaria, 155 
Stylifer, 158 
Styliger, 15 
Stylina, 158 
Stylomenia, 60 
Stylommatophora, 186 
Subemarginula, 149 
Submytilacea, 264 
Subulites, 154 
Succinea, 189 
Supra-intestinal ganglion, 
113 
Sutural lamina, 42 
Symplectoteuthis, 338 
Synapticola, 266 
Synaptorhabda, 253 
Syndosmya, 270 
INDEX 
Taenioglossa, 151 
Tagelus, 274 
Tancredia, 265 
Tanganyicia, 154 
Tanysiphon, 270 
Taonius, 340 
Tapes, 270 
Tectarius, 152 
Tectibranchia, 167 
Tegmentum, 42 
Teinostoma, 150 
Teleodesmacea, 254 
Teleoplacophora, 54 
Teleoteuthis, 339 
Tellina, 268 
Tellinacea, 268 
Telobranchia, 54 
Tentacles, 67 
Terebellum, 155 
Terebra, 166 
Teredo, 275 
Tergipes, 179 
Test, 28, 240 
Testacella, 189 
Tethys, 175 
Tetrabranchia, 332 
Teuthopsis, 342 
Thalassoceras, 335 
Thecacera, 177 
Thecalia, 264 
Thecosomata, 170 
Thermoscopic eyes, 319 
Thliptodon, 173 
Thracia, 275 
Thyca, 155 
Thysanoteuthis, 339 
Titiscania, 150 
Tonicella, 53 
Tonicia, 54 
Torinia, 158 
Tornatellaea, 168 
Tornatellina, 188 
Tornatina, 168 
Torsion (body’s), 74 
Toxiglossa, 165 
Tracheal lung, 106, 189 
Tracheloteuthis, 338 
Trachyceras, 335 
Trachydermon, 53 
Trachyglossa, 343 
Trachyodon, 54 
Trematonotus, 147 
Tremoctopus, 343 
Tresus, 274 
Triauly, 127 
Triboniophorus, 189 
Trichotropis, 156 
Tridachia, 181 
Tridacna, 271 
Trifora, 208 
Triforis, 154 
Trigonia, 258 
Trigonochlamys, 186 
Trinacria, 258 
Triopa, 177 
Triopella, 177 
Triplaca, 168 
Triton, 157 
Tritonia, 175 
Tritonidea, 164 
Tritoniomorpha, 175 
Trochoceras, 333 
Trocholithes, 333 
Trochonema, 150 
Trochosphere, 27 
Trochotoma, 147 
Trochus, 149 
Trophon, 164 
Tropites, 335 
Truncatella, 153 
Tryblidium, 145 
Tudicla, 164 
Tugonia, 273 
Turbinella, 164 
Turbo, 150 
Turbonilla, 158 
Turricula, 164 
Turrilites, 335 
| Turritella, 155 
Turtonia, 266 
Tyleria, 275 
Tylodina, 173 
Tylopoma, 152 
Typhis, 164 
Typhobia, 154 
Umbilicus, 80 
Umbo, 215 
Umbonium, 150 
Umbrella, 174 
Uncimenia, 60 
Uncini, 89 
Ungulina, 265 
Unicardium, 265 
Unio, 268 
Uretery, 182 
Urocoel, 15 
Urocyclus, 187 
Urosalpinxz, 164 
Vaginua, 190 
Valletia, 272 
Valvata, 152 
Vampyroteuthis, 342 
Vanganella, 270 
Vanuxemia, 258 
Velainiella, 148 
Veliger, 27 
Velorita, 266 
Velum, 27 
Velutina, 156 
Veneracea, 270 
