XXXVlll 



INDEX TO GENERA. 



Testacella 



Testacellus 



Telhis . 



Tethys . 



Tethys . 



Tetragonostea 



Tetraplodon 



Teiitliis . 



Text'dia . 



Thais . 



Tliala . 



Tlialessa . 



Thalia . 



Thallepus 



Thallicera 



Thalotia . 



Thaumasia 



Thea 



Tlieba . 



Tliecacera 



Tliecalia . 



Thecaphorus 



Thecidea 



Thecidium 



Theliconus 



Theliderma 



Thelidomus 



Theliostonia 



Theliostyla 



Theniisto 



Theodoxus 



Theora . 



Thetis . 



Thetis . 



Thiara . 



Thiarella 



Thovana 



Thracia . 



Thyas . 



Thyatira 



Thyca . 



Thyreus . 



Tiara 



Tiara 



Tibia . 



Tichocjoyiia 



Tiedemannia 



Tifata . 



Tigris 



Timoclea 



Tivela . 



Tomala . 



Tomella . 



Tomichia 



Tomigerus 



Tonwgeres 



Tonichia 



Vol. i. 47 



i. Ii 



