IIvDEX TO GENERA. 



XXXVll 



Stobilus . 



Stola 



Stomatella 



Stoma tell a 



Stomatia 



Stomatia 



Stomax . 



Stomodonta 



Stramonita 



Strei^hona 



Streptaulus 



Streptaxis 



Streptostyla 



Strigatella 



Strigilla . 



Slrigida . 



Stromhella 



Stromhklea 



StromLina 



Strombiis 



Stromhus 



Strongylocera 



Strophia 



Strophina 



Strophitm 



Strophocheilus 



Struthiolaiia 



Stycla 



Stylifer . 



Styiina . 



Styliola . 



Stylocheilus 



Stylodonta 



Subemargii^ula 



Subula . 



Subiilina 



Suhulina 



Succinea . 



Sulculus . 



Sulla na . 



Sunetta . 



Surciila . 



Susania . 



Sutura . 



Swainsonia 



Sychar . 



Sycotyious 



Symmetroyep, 



Symphynota 



Symphynota 



Syncera . 



Syndosmya 



Synoicum 



Syntethys 



Syntoxia 



Syphonota 



Syriiiffites 



Vol 



liyrus 



PAGE 



ii. 106, 639 



ii, 463 



i. 435 



i. 438 



i. 436 



i. 212 



i. 436 



ii. 179 



i. 127 



i. 143 



ii. 645 



ii. 185, 658 



ii. 109 



i. 173 



ii. 399 



ii. 239 



i. 260; ii. 614 



i. 260 



i. 186 



i. 258 



247, 260 



i. 115 



ii. 168 



ii. 177 



ii. 502 



ii. 147 



i. 282 



ii. 591 



i. 239 



i. 239 



i. 53 



ii. 37 



ii. 186 



i. 453 



i. 224 



ii. 110 



i. 341 



ii. 128 



i. 443 



ii. 658 



ii. 427 



i. 88 



ii. 632 



ii. 526 



i. 180 



i. 289 



i. 198 



ii. 657 



ii. 503 



ii. 501 



ii. 314 



ii. 410 



ii. 600 



ii. 596 



ii. 495 



ii. 34 



i. 456 



