PLATE XLI. 



Fig. 1. Bittium luscinice, n. sp. 



a. The natural size. 



b. The shell, enlarged. 



Fig. 2. Bittium philomelce, n. sp. . 



a. The natural size. 



b. The shell, enlarged. 



Fig. 3. Bittium pupiforme, n. sp. 



a. The natural size. 

 6. The shell, enlarged. 



Fig. 4. Bittium abruptum, n. sp. . 



a. The natural size. 

 6. The shell, enlarged. 



Fig. 5. Bittium delicatum, n. sp. . 



a. The natural size. 



b. The shell, enlarged. 



Fig. 6. Bittium aedonium, n. sp. . 



a. The natural size. 



b. The shell, enlarged. 



Fig. 7. Alaba (Diala) limnseiformis, n. sp. 

 a, The natural size. 



c. The apex, magnified. 



d. The sculpture and base, magnified. 



c. The apex, magnified. 



d. The sculpture, magnified. 



c. The apex, magnified. 



d. The sculpture, magnified. 



c. The apex, magnified. 

 <2. The sculpture, magnified. 



c. The apex, magnified. 



d. The sculpture, magnified. 



c. The apex, magnified. 



d. The sculpture, magnified. 



fc, c. The shell, enlarged ; front and back view. 



PAGE 



545 



54G 



548 



551 



552 



553 



567 



