339 Dominican Fossils — Maury 175 



Scapharca auriculaia Lamarck 

 Plate 28, Figure 3 

 Area auriculaia Lamarck, An. s. Vert., vol. 6, p. 43, 1819. 

 Area, {Scapharca) auriculaia Dall, Trans. Wagner Inst. Sei.,vol. 3, pt. 

 4, p. 649, 1898; Id. pt. 6, p. 1586, 1903. 

 Area auriculaia Sheldon, Palaeontographiea Amer., vol. i, p. 50, pi 

 11, fig. 19, 1916. 

 Our fossil is identical in every respect with recent shells on 

 the Monte Cristi beach. A. atiriculata occurs at Bowden and in 

 the Limon, Costa Rica, Pliocene. It is now reported for the first 

 time from the Dominican Tertiaries. 



Locality. — (Exp'd '16) Sabaneta (loose, not in situ). 



Scapharca cor-cupidonis, n. sp. 

 Plate 30, Figures 5, 6, 7 



Shell small, cordiform, solid, inequivalve, the left extending 

 considerably beyond the right; the posterior oart of the shell is 

 short but the posterior margin is curved, not straight; anterior 

 and ventral margins rounded; shell roundly and excessively in- 

 flated. The ribs number very uniformly twenty-five, those of 

 the left valve do not vary much but the posterior are somewhat 

 smaller and those ending at the anterior ventral margin are larg- 

 est; the ribs are about as wide as the interspaces except anterior- 

 ly where they are more widely spaced, all the ribs of the left valve 

 are handsomely and evenly nodular; right valve with anterior 

 ribs nodulose as in the left, central ribs and those over the um- 

 bonal ridge narrow and smooth ; ribs on the dorsal half of the 

 posterior slope nodulose. Beaks high. narrow, pointed, strongly 

 incurved and directed forward; cardinal area with a few grooves, 

 wide in front of the beaks, narrow, with a raised margin behind; 

 hinge line about two- thirds the length of the shell; teeth medium 

 in size, the posterior series about twice as long as the anterior, 

 teeth vertical except at the ends of the series where they are 

 slightly longer and oblique but not conspicuously so. Length 2 1 , 

 altitude 21, ■ diameter 21, a more inflated shell measures in 



