381 Costa Rica Miocene — Olsson 209 



the synchronous 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 fo.ssil of the eastern United States. 

 Gatun Stage: Water Caj', 



Old Man SamCreek, i mile south of the beach. 



Genus LIMAEA, Born 

 Limaea solida Dall Plate 28, figure 10 



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

 p. 769. Pl- 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. 4, Red Cliff Creek. 



Genus ANOMIA, (I,inne) Muller 

 Anomia simplex d'Orbigny Plate 21, figure 6 



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



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

 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. 



2.S7- 

 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 shnplex is both common and characteristic in 

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



