38i 



Costa Rica Miocene — Olsson 



the S3mchronoiis Calvert formation of Maryland. It is also found 

 as a lower Miocene fossil in Florida and Dall recorded it from 

 the Bowden beds of Jamaica and from the Oligocene of Gual- 

 lava, Costa Rica. The P. marginata Conrad is an Upper Chea- 

 peake Miocene and Pliocene fossil of the eastern United States, 

 Gatun Stage: Water Cay^ 



Old Ma?i SainCreek, i mile south of the beach. 



Genus LIMAEA, Born 

 Limaea solida Dall Plate 28, figure 10 



Limcea solida Dall, 1898, Trans, Wagner Free Inst. Sci., vol. 3, pt. 4, 

 p. 769, pi. 35, figs. 4, 5. 



A small, solid shell, externally sculptured like a small Gly- 

 cymeris. It has 12 rounded ribs and a coarsely crenulated basal 

 margin. Our single specimen from Costa Rica is a little smaller 

 than Ball's specimens from Bowden. 



Gatun Stage: Coll. Red Cliff Creek. 



Genus ANOMIA, (Linne) Muller 

 Anomia simplex d'Orbigny Plate 21, figure 6 



Anomia ephippium Conrad, 1845, Fossils of the Medial Tertiary, p. 



75, pi. 43, fig. 4. Not of Ivinne. 

 Anomia simplex d'Orbigny, 1845, Hist. Pol. y Nat. Isla de Cuba, p. 



367. 



Anomia ephippium Gabb, 1873, Trans. Amer. Phil. Soc, vol. 15, p. 

 257- 



Anomia simplex Dall, 1898, Trans. Wagner Free Inst., Sci., vol. 3, 

 pt. 4, p. 784. 



Anomia simplex Bose, 1906, Boll, de Inst. Geol. de Mexico, numero 



22, p. 25, pi. 2, figs. 18-23. 

 Anomia simplex Maury, 1917, Bull. Amer. Pal,, vol, 5, p. 355, pi. 26, 



fig- 15. 



The Anomia simplex is both common and characteristic in 

 the Gatun of Costa Rica as well as in certain parts of the Prov- 



