Dominican Fossils — Maury 233 



reaching the posterior end of the right valve. A large shell meas- 

 ures 6.5 in length, 4.75 altitude, 2 mm. semidiameter, but the 

 great majority are smaller. 



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



Corbula ( Cuneocorbula) caimitica, n. sp. 



Plate 39, Figures 18, 19 



? Corbula contrada Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 247, 

 1873. Not C. contrada Say, 1822. 



Gabb lists Corbula contracta in his Santo Domingo Report, 

 but none of the specimens we collected agree with our specimens 

 of C. contracta from the Carolinian Pliocene. Moreover, fide 

 Dall the latter species does not occur anterior to the Pliocene. 

 We have a few valves from Rio Cana perhaps identical with 

 what Gabb called contracta. They are, however, more like 

 d'Orbigny's figure of the recent C. ca,ribcca, but our fossils are 

 more sinuous, contracted and pointed posteriorly. Slightly larger 

 than C. cercadica and differing in outline, they are readily distin- 

 guished by their much sharper and stronger concentric sculpture. 

 Valves discrepant, the left being smaller and flatter. A large 

 right valve measures in length 7, altitude 4.75, semidiameter 

 3 mm. 



Locality. — (Exp'd '16) Zone H, Rio Cana at Caimito. 



Corbula (Botlirocorbula) vi?ninea Guppy 

 Plate 39, Figures 20, 21 



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



293, pi. 18, fig. 11, 1866. 

 Botlirocorbula viminea Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 247, 



1S73. 

 Corbula viminea Guppy, Quart. Jour. Geol. Soc., vol. 32, p. 529, 



1876. 

 Corbula {Bothrocorbula)viminea Dall, Trans. Wagner Inst. Sci., vol. 



3, pt. 4, p. 850, 1898. 



This species is remarkable for a very deep sub- circular, lun- 

 ular pit directly in front of the beak. Because of this Gabb 



