PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 367 



IS rather coarse, the ribs being strougywith wider and concave intervals; 

 the whorls are strongly angularly shouldered, each of the ribs ending in 

 a distinct nodule, formed by the first spiral groove below the shoulder, 

 which is stronger than the rest; the flattened subsutural area is nearly 

 or quite destitute of spiral lines, but is crossed by slight tiexuous exten- 

 sions of the ribs ; the whole surface below the shoulder is covered with 

 strong spiral lines, between the ribs. On the upper whorls a few of the 

 revolving lines are stronger than the rest, forming with the ribs a 

 coarsely cancellated structure. 



The dentition is very characteristic, and entirely different from B. 

 cxarata, B. haqmluria, and other allied forms. The uncini are broad, 

 flat, lanceolate, with a sharp, slightly barbed tip, and with a broad 

 bilobed base. 



This species has frequently been dredged by us in Massachusetts Bay, 

 Bay of Fuudy, &c., in 5 to 50 fathoms. 



Bela simplex (Middend.). 



G. O. Sars, Moll. Ke«,^ Arct. Norv., p. 239, pi. 17, fig. 4 ; pi. 23, fig. 11 ; pi. ix, 



fig. 9 (dentition). 

 Bda Iwvigata Dall (teste G. O. Sars). 



One dead, but fresh, small specimen, from station 894. The whorls 

 are very convex and evenly rounded, nearly smooth, but covered with 

 fine and close spiral lines, crossed by still finer lines of growth ; sub- 

 sutural zone smooth. The apex of the spire is acute. The three apical 

 whorls are chestnut-brown ; their surface is finely decussated by equal 

 lines running in opposite directions. 



Bela hebes Verrill, sp. nov. 



Shell short-fusiform or subovate, with a short, blmit spire and five 

 well-rounded, slightly turroted whorls: suture impressed. Sculpture 

 numerous small, regular, raised, spiral ridges, with wider interspaces, 

 those just below the suture stronger and more distant; lines of growth 

 faint. Aperture narrow-ovate. Outer lip expanded below the suture, 

 then regularly rounded, thin ; the ])osterior sinus is broad and shidlow ; 

 camil short and broad, straight; columella regularly incurved. Epi- 

 dermis thin, greenish white. Length, 8'"'"; breadth, 5"""; length of aper- 

 ture, 5""; its breadth, 1.80"""; length of body- whorl, front side, CSo"""". 



Stations 891 and 892, in 500 and 487 fathoms ; four specimens. 



Pleurotoma (Pleurotomella) Agassizii Verrill & Smith. 



Anier. Journ. Sci., xx, p. 394, for Nov., 1880 (published Oct. 25). 



This large and elegantly sculptured species occurred sparingly, living, 

 in many of the oti'-shore localities (8G9, 871, 874, 877, 880), in 05 to 252 

 fathoms, but it was taken in larger numbers at stations 891 to 895, in 

 238 to 500 fathoms. The two nuclear whorls are very small, chestnut- 

 brown, scarcely carinated, rounded, with the surface finely cancellated 

 by lines running obliipiely, in two directions, but close to the suture 

 only the transverse lines appear. 



