Diagnosis. Shell large, but slightly curved, nearly straight, solicl, slowly tapering; 

 cream-white ^vith whitegray-white ribs. Sculpture : near the apex 1 7 subequal but uneciually 

 spaced, narrow, sharply defined riblets very much narrower than the interspaces; these continue 

 to the aperture, increasing in size; their number is early increased by the intercalation of some 

 interstitial threads, mainly on the concave side, so that at the aperture there are 25 unequal, 

 unevenly spaced ribs and threads ; the whole surface densely and conspicuously striated trans- 

 versely, the striae unequal, like cords scattered among threads, crenulating the riblets. Aperture 

 oblique, subcircular, a trifle wider than long, the peristome jagged from fracture. Apex large, 

 the orifice .simply circular, without notch or slit. 

 Length 78,5, diam. at aperture 10, at apex 3,2 mill. (P. & Sii.). 



D i s t r i b u t i o n. 50 miles off Aden in 678 fms. 



R e m a r k s. A large species apparently without near allies. It is remarkable for the 

 proininence of the growth striae, and the clearly carved ribs of the surface. (P. & Sh.). 



33. Dentaliiiiii transversostriatiiin n. sp. PI. IV, fig. 23. 



Stat. 212. 5°54'.5S., 120° 19'. 2 E. off Saleyer. 462 Metres. Fine grey mud. 3 Spec. 



Diagnosis. Shell but slightly curved, the greatest bend near the apex, solid, of a 

 yellowish tint, lusterless. The sculpture consists of 14 — 19 strong prominent sharp-edged lon- 

 gitudinal ribs, separated by rather wide concave interstices in some of which an interstitial 

 riblet arises. The longitudinal ribs are crossed by a pronounced transverse sculpture, consisting 

 of regular elevated striae, which become almost spinulose on the longitudinal ribs, and can be 

 feit by rubbing one's nail over the shell's surface. Apex simple, or with a long wide .slit on 

 the convex side. Anterior aperture circular rather oblique with very thick edges. 

 Length 55, diam. of apert. 7,5 mill. Length of slit 8 mill. 



R e m a r k s. To my regret I had no opi^ortunity of comparing specimens of D. carditus 

 Dall ^), a species reported from several stations in the West Indian Archipelago. It bears a 

 very great resemblance to transversosiriatuiii but as it differs from it in some minor details, 

 it seems advisable to distinguish as yet the Western Atlantic from the Indopacific form. In 

 the East Indian specimens the sculpture remains distinct toward the anterior aperture and the 

 edge of the peristome is very thick, measuring in one specimen 1,2 mill. in another i mill., two 

 qualities which distinguish it from carditus. The niunber of the ribs of carduus is not given. 



34. Dentaliuiii malayaniini n. sp. PI. V, figs 4, 5. 



Stat. 133. Anchorage off Lirung, Salibabu Lsland up to 36 Metres. Mud and hard saiid. 2 Spec. 

 Stat. 159. o°59'.iS., I29°48'. 8 E. North of Kofian lsland. 41 1 Metres. Coarse sand. I Spec. juv.? 

 Stat. 300. io°48'.6S., I23°23'.i E. Timor Sea. 918 Metres. Fine grey mud. 2 Spec. 



Diagnosis. Shell slightly curved, solid; sculpture of 16 — 17 narrow rounded ribs at 



i) D. carduus Dall. Bl.\ke, Rep. Buil. Mus. Comp. Zool. XVIII, (1889), p. 423, pi. 27, fig. 3. 



