395 Dominican Fossils — Maury 231 



main interior rib passing more or less obliquely from the beak 

 towards the straight ventral margin. Length 24, altitude 10, 

 semidiameter 2 mm. ; a larger shell measures 32X12. 



Fragments from the Chipola beds, Florida, have been doubt- 

 fully referred to this species. 



Localities — (Exp'd '16) Bluff 3, Cercado de Mao; Zone H, 

 Rio Cana at Caimito. 



Genus Mactra (Linne) Lamarck 

 Mactra (Mactrella) cf. alata Spengler 



Mactra alata Spengler, Skrivt. Nat. Selsk., vol. 5, pt. 2, p. 99. 

 Mactrella alata Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 248, 1873. 

 Mactra alata Dall and Simpson, Bull. U. S. Fish. Comm., vol. 20, pt. 

 1, p. 474, 1900. 



We found a fossil shell which may be the young of M. alata 

 of which our party gathered many large, fine specimens on the 

 Monte Cristi beach. Gabb remarks that his fossils were also 

 small, but in other respects resembled the recent which then was 

 recorded only from the West coast of Columbia. Later it was 

 found by Gundlach in Porto Rico. 



Locality. — (Exp'd '16) Bluff 3, Cercado de Mao. 



Genus Corbula Lamarck 



Corbula (Aloidis) vieta Guppy 

 Plate 39, Figure 13 



Corbula vieta Guppy, Quart. Jour. Geol. Soc. London, vol. 22, p. 



580, pi. 26, fig. 8, 1866. (Right valve). 

 Erycina tensa Guppy, Id., p. 582, pi. 26, fig. 6, 1866. (Left valve). 

 Corbula disparilis Gabb Trans. Amer. Phil. Soc, vol. 15, p, 247, 1873. 



Not disparilis d'Orbigny 1845. 

 Corbula vieta Guppy, Quart. Jour. Geol. Soc, vol. 32, p. 530, 1876. 

 Corbula {Aloidis) vieta Dall, Trans. Wagner Inst. vol. 3, pt. 4, p. 



849, 1898. 



We have about half a dozen right valves of this species, the 

 largest measuring in length 10, altitude 10, semidiameter 5.5 mm. 

 The majority are much smaller. The left valve is very different 



