353 Dominican Fossils— Maury 



spaces smooth except for fine, concentric growth lines; ears rather 

 large, nearly equal, triangular, feebly radially threaded towards 

 the base, otherwise smooth. Length 29, altitude 27, semidiam- 

 eter6mm. This shell is distinguished from our other Pectens by its 

 few ribs, equilateral form and nearly equal, large ears. It has 

 been kindly examined for us by Dr. Dall and not identified with 

 any species in the National Museum, nor does it correspond to 

 any of Sowerby's or Gabb's descriptions of unfigured Dominican 



species. 



Locality. — (Kxp'd'16) Bluff 2, Cercado de Mao. 



Pecten caimitica, n. sp. 

 Plate 34, Figure 12, 



We collected a single valve of a Pecten examined by Dr. Dall 

 and not identified by him with any in the National Museum from 

 Bowden or Santo Domingo. The shell is suborbicular, slightly 

 oblique, convex in the umbonal region but elsewhere rather com- 

 pressed; surface ornamented with twenty-two narrow, rounded, 

 radial ribs with narrower, concave interspaces; ribs and inter- 

 spaces marked only by concentric, looped growth lines; ears very 

 small, nearly equal, radially threaded. Length 20, altitude 20, 

 semidiameter 5 mm. The species is distinguished by it more 

 numerous ribs and very small ears. 



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



Pecten hatoviejonis, n. sp. 

 Plate 34, Figures 13, 14 

 Shell fan-shaped, but markedly oblique; right valve deeper 

 and more convex than the left; ears small; ribs about twenty-one; 

 on the proximal portion of the shell the ribs are narrow, nearly 

 smooth, except on the posterior slope of the right valve where 

 they are somewhat spiny; interspaces deep, concave, marked 

 only with growth lines; suddenly more squamose sculpture devel- 

 opes simultaneously on both valves, the ribs become medially 

 grooved, the interspaces develop two radial threads each, and 

 both ribs and interspaces become decidedly squamose. Lengtl 



