VIVIPARA. 33 



The peculiar constriction of the upper por- 

 tion of the Up as shown in the figure (Plate 

 13, fig. 7), is very usual in adult specimens. 

 Mr. Lea described from a single deformed spe- 

 cimen (Plate 15, fig. 1) many years ago, with- 

 out giving a figure ; it was therefore impossi- 

 ble for Mr. Anthony to avoid making a 

 synonym. I think the Alabama locality some- 

 what doubtful. 



Subo;enus TULOTOMA, Haldeman. 



22. VIVIPARA BIMONILIFERA, Lea. 

 V. magnifica, Haldeman, Plate 11. 



This species has only as yet been found in 

 the waters of Alabama. 



[59] 



