TERTIARY MOLLUSCA. 151 



Venericardia globosa, new species. 

 (Plate 15, Figures 4 a-c.) 



The following is a description of this species: 



Shell orbicular, highly inflated; ribs more than 20, with nearly equal inter- 

 spaces; beaks medial, low; margins crenulated within. 

 Alt., 33.5 mm.; Ion., 35.5, mm.; diam. of left valve, 19 mm. 



The species grew to be at least twice as large as the specimen measured. 



All the specimens of this species are so badly worn as to prevent 

 accurate determination of the sculpture; 20 ribs can be counted on 

 the type specimen, and it is probable that at least 5 more were origin- 

 ally present. Where the ribs have been partly eroded they present a 

 peculiar cellular structure, beneath which may be discerned concentric 

 sculpture of close, wavy threads. 



This species, remarkable for its inflation, can not be confused with 

 any other known American species. Venericardia bulla, which, per- 

 haps, is as close to this species as any other, is less inflated, much 

 longer, and has higher beaks. 



Localities. Point between Colombier Point and bay next to St. Jean 

 Bay and point between Anse Ecaille and Anse Lizard, St. Bartholo- 

 mew (stations 68976 and 6897), Vaughan. 



Geologic horizon. Eocene. 



Type.U. S. Nat. Mus. No. 167196. 



Venericardia vaughani, new species. 

 (Plate 16, Figures 2 a-c.) 



The following is a description of this species: 



Shell subquadrate; beaks high, prosogyrate, situated near the anterior 

 quarter; ribs about 17, broad, separated by nearly equally wide interspaces; 

 ribs on the anterior third set with transversely elongated nodes, other ribs 

 rounded, flattened, or acutish. 



Alt., 45 mm.; Ion., 47 mm.; diameter, about 30 mm. 



Locality. Point between Anse Ecaille and Anse Lezard, St. Bartho- 

 lomew, station 6897, Vaughan. 



Geologic horizon. Eocene. 



Type.U. S. Nat. Mus. No. 167195. 



Venericardia species. 

 (Plate 16, Figure 3.) 



A fragment of the left valve of a large species of Venericardia was 

 found at station 6897, St. Bartholomew. It appears to be related to 

 Venericardia planicosta, but possesses nodules on the anterior ribs and 

 its lunule is not erect as in that species. 



Locality. Point between Anse ficaille and Anse Lezard, St. Bartho- 

 lomew, station 6897a, Vaughan. 



Geologic horizon. Eocene. 



Figured specimen. U. S. Nat. Mus. No. 167197. 



