DESCRIPTION. 141 



genus in Gmelin's edition ; but is here selected as 

 an example of the third, being much more remark- 

 ably umbilicate than many which are so denomi- 

 nated. 



Fig. 4. C. Moneta. 



Shell margined, knotty, white. 



Lister Conch. Tab. 709. Fig. 59. 



Specimen on the back purplish white, outer lip 

 with a row of raised knots, and a single one near 

 the anterior part of the inner lip. 



Fio;. 5. Bulla Volva. 



Shell birostrate ; beaks elongated, acute, and 

 striate. 



Lister Conch. Tab. 711. Fig. 63. 



Specimen white with a tinge of pink within, 

 thin, subglobular, finely striated transversely; 

 beaks rather bent backwards. 



Inhabits Jamaica. 



Fig. 6. B. Ficm. 

 . Shell obovate, club-shaped, reticulately striate ; 

 beak exserted ; suture of the spire obUterated. 



Lister Conch. Tab. 751. Fig. 46. a. 



