314 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 57. 



GRYPHUS BORNEOENSIS, new species. 



Shell large, yellowish white, with tinges of brown, inflated, broadly 

 and squarely folded anteriorly; apparently smooth but showing 

 under a lens fine radial threads with wider interspaces and conspicu- 

 ous, not very dense punctation; pedicel valve with a moderate entire 

 foramen, the beak so strongly incurved as to hide entirely the nar- 

 row concave, coalescent deltidial plates, which in loose valves show 

 more or less prominently four or more threadlike cross ridges mesially 

 obsolete; there is a well marked "collar" inside the foramen; the 

 muscular scars are well impressed; the brachial valve has wide con- 

 cave crural plates well divided to the apex where there is a small 

 but prominent cardinal process ; the hinge teeth are small, the crura 

 triangular and short, the loop short, widening forward, the lower part 

 without a posterior sulcus, slightly medially ridged, angular and 

 sharply pointed at the anterior corners, but with no medial projec- 

 tion, a short threadlike ridge divides the slightly impressed muscular 

 scars; the anterior edge has a squarish not very deep indentation for 

 the projection of the pedicel valve. Height of shell 41; width 33; 

 diameter 25 mm. U. S. Nat. Mus. Cat. No, 229297. 



Type locality. — South of Silungan Island, Sibuko Bay, Borneo, 

 at Station 5592, in 305 fathoms, bottom temperature 43° 3 F. 



This species recalls G. hartletti Dall, but is wider and more rounded, 

 with a wider and less emphatic fold, and there are small differences 

 in the form of the loop. The young shell, judging by the incremental 

 lines, is subcircular or even a little wider than high. 



GRYPHUS BARTLETXn Dall. 



Terebratulabartlettii Dall, Amer. Naturalist, vol. 16, p. 885, Nov., 1882; Bull. 

 Mus. Comp. Zool., vol. 12, No. 6, pp. 200-201, pi. 6, fig. 4a-c, 1886.— David- 

 son, Mon. Rec. Brach., pt. 1, p. 14, pi. 1, figs. 20-21. 1886. 



Type locality. — Barbados, 73 fathoms. Captain Bartlett. 



