254 Bulletin 39 436 



The Costa Rican specimens are fragmentary but there can be 

 little doubt of their identity with the Tellina cercadica Maury 

 from the Miocene of Santo Domingo. 



The shell is thin and strongly depressed. The surface is 

 polished and obliquely striated with fine lines. It is related to 

 the recent Pacific Tellina delicatvla Deshayes. 



Gatun Stage: Coll. G, Saury creek. 

 Estrella River. 



Genus TELLIDORA, Moerch 



Tellidora cristata Recluz Plate 26, figurce i, 2 



Lucina cristata Recluz, 1742, Revue Cuvier., p. 270. 

 Tellidora cristata Dall, 1900, Trans. Wagner Free Inst. Sci. , vol. 3, 

 pt. 4, p. 1037. 



A recent species of the West Indies and previously known 

 as a Pliocene and Pleistocen.e fossil from Carolinas. The fossil 

 Costa Rican shells are frequently larger than the recent form 

 and with the dorsal margins more nearly in line. It is not rare 

 in the form of impressions but the perfect shell is seldom found. 



Gatun Stage: Hills la, 2 a.7id j, Banana River. 



Genus STRIGILLA, Turton 



Strigilla pisiformis Linne 



Tellina pisiformis Linne, 1758, Syst. Nat., ed. 10, p. 677. 

 Strigilla pisifortnis Dall, 1900, Trans. Wagner Free Inst. Sci., vol, 3, 



pt. 5, p. 1038. 

 Strigilla pisiformis Maury, 1917, Bull. Amer. Pal., vol. 5, p. 389, pi. 



39, fig. 6. 



This species is rare as a fossil in Costa Rica. It is very 

 common as a recent shell on the sandy beaches along the en- 

 tire north coast of both Panama and Costa Rica, where it occurs 

 with Donax denticulata Linne and a few other species. It is 



