404 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



Area (Scapharca) devexa Pils and Johns. Plate XL], figs. 8, 9. 



Proc. A. N. S. Phila. 1917, p. 187. 



Area (Scapharca) intumulata Pils. and Johns. Plate XXXIX, figs. 7, 8, 9. 

 Proc. A. N. S. Phila. 1917, p. 187. 



Area (Scapharca) proletaria Pils. and Johns. Plate XXXIX, figs. 5, 6. 

 Proc. A. N. S. Phila. 1917, p. 188. 



Area grandis Broderip and Sowerby. Plate XL, fig. 1. 



Area grandis B. and S., Zool. Journ. iv, 1829, p. 365. Reeve, Conch. Icon. 



ii, pi. 1, fig. 4. Kobelt, Syst. Conch. Cab. p. 41, pL 12, fig. 1. Carpenter, 



Rep. B. A. A. S., for 1856, pp. 1, 249, ph 6, figs. 1-4. 

 Area (Anadara) grandis Brod. and Sby., Gabb, Trans. Amer. Philos. Soc, xv, 



p. 253, in part. 

 Area patrieia Maury. BulL Amer. Pal. v, pi. 27. 



There are twelve large valves of this species in the Gabb collec- 

 tion from Santo Domingo (no. 2720, 2721), two from 20 miles west 

 of Azua, Haiti, collected by Mr. Lloyd B. Smith (no. 2662), and 

 nine from near Cartagena, Colombia (no. 2661), also taken by Mr. 

 Smith. We formerly thought that the fossils of the Caribbean area 

 were separable from A. grandis of the recent Panamic Province, but 

 a close study of all the material shows that no separation can be 

 made.^^ 



While somewhat related to A. chiriquiensis Gabb, this species 

 differs in shape and by the smaller number of ribs, 24 to 26; chiri- 

 quiensis having 28 to 30. They are larger, and remain better de- 

 veloped on the posterior dorsal slope. The shell is nearly equi- 

 valve, extremely large, solid and heavy. The posterior lower angle 

 is produced, anterior end rounded, basal margin nearly straight. 

 The beaks are extremely large, giving the shell a triangular con- 

 tour, and projecting far above the hinge. Cardinal area very broad, 

 in form of a nearly symmetrical triangle, being scarcely or not longer 

 posteriorly than in front of the beaks ; marked with grooves meeting 

 at a wide angle (but in adults usually eroded, showing the striation 

 derived from growth of the teeth). Sculpture of 25 strong radial 

 ribs, the anterior ones slightly granulated (this is more obvious in 

 the young) ; the granules, transverse, rather widely and unevenly 

 spaced. Intercostal spaces show rather sharp growth-striae. The 



^^Mr. Gabb reached the same conclusion; but as he included A. chiriqiiiensis, 

 and thought A. tolepia the young, his decision has not influenced the opinion ex- 

 pressed above. 



It maybe noted that J. C. Moore identified A. grandis, with some doubt, from 

 Mr. Heneken's second sending of Santo Domingo fossils, in Q. J. Geol. Soc, ix, 

 1853. 



