INDEX TO THE GENERA, 



XV 



Tapes, iv, 4-8. 

 Tellina, in. 5-16. 

 Terebratula, IX, 18-20, 

 Teredo, I. 1-6. 

 Testacellus, xxn, 13, 14, 

 Thracia, n. 5-9. 

 Tornatella, XX. 1. 

 Trichotropis, xvi, 26, 

 Triton, xvin. 1, 2, 

 Trochus, xi. 8-20. 

 Trophon, xvin. 20-24, 

 Truncatella, xvi. 12, 

 Turritella, xv. 1-3, 

 Tuvtonia, vj. 4, 



Unio, vn, 1-3, 



Valvata, xn. 10, 11, 

 Velutina, xvi. 21, 22, 

 Venerupis, 1. 18. 

 Venus, iv. 12-16. 

 Vertigo, Pupa. 

 Vitrina, xxn, 15-16, 



Xylophaga, i, 7. 



Zonites, xxn. 17-29 ; 

 £ua, xxiv, 22, 



