i82 BuivLETiN 39 354 



Area noes Guppy, Journ. Geol Soc. London., vol. 22, p. 293. 

 Area occidentalis Sheldon, 1916, Paleont. Amer. , vol. i, p. 8, pi. i, 

 figs. 8-1 1. 



Area occidentalis Maury, 1917, Bull. Amer. Pal. vol. 5, p. 327, pi. 29, 

 fig- 3- 



This is a common recent species of the West Indian and 

 Caribbean fauna. As a Miocene fossil it is found in Jamaica 

 and Santo Domingo and it is here recorded from the Miocene of 

 Costa Rica. 



Gatu7i Stage: Port Limon. 



Area umbonata Lamarck Plate 22, figure 2 



Area umbonata Lamarck, 1819, An. s. Vert., vol. 6, p. 37. 



Area inibrieata Gabb, 1873, Trans. Amer. Phila. Soc, vol. 15, p. 254, 



In part. 

 Area umbonata Sheldon, 1916, Palseont. Amer., vol. i, p. 8. pi. i, 



figs. 12-17. 



Area umbonata Maury, 1917, Bull. Amer. Pal., vol. 5, p. 327, pi. 30, 

 fig. II. 



Area niubonata Maur}', 1920, New York Academy of Science, Sci. Sur. 

 of P. R. , vol. 3, pt. I, p. 6. 



The Area umbonata and the preceding occidentalis area com- 

 mon as recent shells along the entire northern coast of Panama 

 and Costa Rica. The A. umbonata is recognized by its more 

 convex and angular shell and liner sculpture of the middle of 

 the shell disk. As a Gatun fossil we have but a single small 

 shell from the East Grape Point Creek. Dr. Maury records 

 the species from the Miocene of Santo Domingo and from 

 Porto Rico. 



Gatiai Stage: Coll. /, East Grape Point Creek. 



Subgenus BARBATIA (Gray) Adams 



Area Mauryae, n. sp. Plate 22, figure 4, 7 



Barbatia of. Bonaezyi Maury, 1917, Bull. Amer. Pal., vol. 5, p. 329, 

 pi. 30, fig. 15. Not of Gabb. 



