44 
2089 Thais emarginata 
2087 Thais plicata 
2088 Variety septentrionalis Reeve. 
2327 Thracia plicata Desh, 
1098 Thracia beringi Dall. 
1097 Thracia curta Conrad. 
285 Thracia curta Conr 
286 Thracia plicata ? Desh 
1811 Thysanophora Hornii 
1812 Thysanophora Ingersolli 
1813—Variety convexior Ancey. 
116 Tivela crassatelloides 
2139 Tivela planulata Sby. 1829. 
2140 Tivella hians Phil. 1851. 
2141 Tivela arguta Roemer. 1864. 
2142 Tivela Byronensis Gray. 1838. 
2143 Tivela Delesserti Deshayes. 1854. 
2144 Tivela stultorum Mawe. 
117 Tivela radiata 
1270 Tonicella lineata Wood. 
1271 Tonicella submarmorea Middendorf. 
1272 Tonicella marmorea O. Fabricius. 
2241 ‘Tonites wascoensis 
262 Tornatella punctocelata Cpr 
456 Tornatina carinata Carpenter. 
457 Tornatina cerealis Gould. 
1099 Tornatina culcitella Gould. 
263 Tornatina eximia Baird 
1100 Tornatina harpa Dall. 
1101 Tornatina inculta Gould. 
1268 Trachydermon dentiens Gould. 
1269 Trachydermon flectens Carpenter. 
1650 Trachydermon Hartwegii 
1649 Trachydermon (Cyanoplax) Raymondi 
1703 Trachydermon Sharpii 
2138 Transennella tantilla Gould. 1853. 
1648 Tresus Nuttallii Conr. 1837. 1181 
1002 ‘Trichoptropis bicarinata Broderip. 
1103 Trichotropis cancellata Hinds. 
1243 Trichotropis inermis Hinds. 
1473 Trichotropis? Kelseyi Dall. 
590 ‘Triphoris adamsi. Off Chatham Island. 
1241 Triforis adversa Montagu. 
2503 ‘Triopha grandis 
2502 Triopha maculata 
587 Triphoris alternatus C. B. Adams. Panama. 
577 Triphoris callipyrgus 
578 Triphoris carpenteri 
580 Triphoris catalinensis 
589 Triphoris chathamensis. Chatham Island. ............ 
585 Triphoris dalli. Panama. 
583 Triphoris excolpus 
588 Triphoris galapagensis. Galapagos Islands. 
579 Triphoris hemphilli 
586 Triphoris inconspicuus C. B. Adams. Panama. 
575 Triphoris montereyensis 
584 Triphoris panamensis. Panama. 
576 Triphoris pedroanus 
582 Triphoris peninsularis 
581 Triphoris stearnsi 
