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50 CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 



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Genus UNIO Philipsson, 1788. 

 Unio sp. indet. Plate VIII, Figures 18, 19. 



A number of casts of large molluscan shells were collected by Mr. Veatch 

 along the shores of the Gulf of Paria, in a white, decayed limestone rock. None 

 can be specifically determined, and the majority not even generically. The ex- 

 ample referred to above, however, fortunately shows the characteristic heavy, 

 alternating teeth of Unio. 



Locality. — One mile west of the Godineau River, about midway between San 

 Fernando and La Brea, along the shores of the Gulf of Paria, Trinidad. 



Geological horizon. — Probably Oligocene, from its stratigraphic position, but 

 no evidence can be gathered from the fossil because of its very imperfect condition. 



Unio sp. indet. Plate IX, Figure 1. 



It is not possible to say positively whether these shells are remains of a 

 large Mactra and hence of marine origin, or fragments of a large Unio and of 

 freshwater origin. Their state of preservation is exceedingly imperfect. But 

 the association of one with the cast of a smaller shell showing the teeth of Unio 

 inclines one to believe them members of the latter genus. 



Locality. — One mile west of the Godineau River, along the shore of the Gulf 

 of Paria, about midway between La Brea and San Fernando, Trinidad, in a 

 white, decayed limestone rock. 



Geological horizon. — Probably Oligocene, judging from the stratigraphic posi- 

 tion of the bed. 



Genus ANODONTA Lamarck, 1799. 

 Anodonta? sp. indet. 



Remarks. — Associated with the moulds of a large and small species of Unio 

 in the white, decayed lime rock between La Brea and San Fernando, is the mould 

 of a large, convex shell which has much the aspect of an Anodonta. Its form 

 recalls such species as A. grandis of North American rivers and the larger, simi- 

 larly shaped A. gigantea Spix from the rivers of Brazil. 



Locality. — One mile west of the Godineau River, along the shores of the Gulf 

 of Paria, about midway between La Brea and San Fernando, Trinidad. 



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Genus VENERICARDIA Lamarck, 1801. 



Venericardia alticostata Conrad. 



Cardita alticostata Conrad, Amer. Jour. Sci., vol. XXIII, p. 342, 1833. 



Venericardia perantiqua Conrad, Amer. Jour. Conch., vol. 1, p. 8. 



Venericardia alticostata Harris, Bull. Am. Pal., vol. I, pp. 171-172, pi. 4, fig. 12, 1896. 



Conrad y s original description. — " Shell subcordate, convex, with about twenty- 

 two profoundly elevated nodulous ribs, which on the anterior side are laterally 

 carinated. Length two inches." 



Type locality, Claiborne, Alabama. 



Remarks. — Several specimens of this species are in the indurated shell breccia 



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