343 Dominican Fossils — Maury 179 



Scapharca {Argina) tolepia Sheldon, Palseont. Amer., vol. 1, p. 63, 

 pi. 15, figs. 14, 15, 1916. 



This species is an Argina very close to the typical recent 

 campechensis. The type locality is Rio Amina. It has also been 

 found at Bowden and Cumana. 



Scapharca (Cunearca) Willardausteni , n. sp. 

 Plate 29, Figures 6, 7 



Shell inequivalve, thin, oblique, produced along the umbonal 

 ridge; teeth, hi ge and cardinal area as in Cunearca but the area 

 is rather long and narrow for the group, and sometimes marked 

 with one or two irregular grooves parallel to the hinge margin. 

 On both valves there are two shallow sulci, one as usual anterior 

 to the umbonal ridge, the other slightly anterior to the center of 

 the valve, extending to the point on the ventral margin where the 

 extension of the left valve abruptly begins. Ribs about thirty- 

 six; those anterior to the median sulcus with transverse nodules; 

 all those posterior to this sulcus smooth on both valves; sculpture 

 nearly the same on both valves except that the smooth central 

 ribs on the face of the left valve are much wider than the inter- 

 spaces; while on the right little wider than the interspaces. Right 

 valve sometimes with an obscure interstitial line near the umbon- 

 al ridge. This species is separated from other Cunearcas by its 

 oblique, produced posterior end and by the smooth ribs on the 

 face of the left valve. It lacks to some degree the erect, well- 

 sculptured appearance usual in Ctmearca. Length 42, altitude 

 32, semidiameter 14 mm. 



A. cumanensis Dall from Bowden and Cumana is also a 

 member of the A. incongrua group but is much smaller, and is 

 short and high with high, prominent beaks while the reverse is 

 true in our shell. 



I take great pleasure in naming this shell in honor of Mr. 

 Willard Austen, Librarian of Cornell University, in appreciation 

 of his so kindly facilitating the literary part of this investigation. 



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



