1886. j PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 301 



with the color lading into white toward the apex. This shell is rare, 

 and also strictly arctic. Professor Sars and Mr. Friele, to whom it 

 was submitted, in 1878, considered it a good species. Its nearest rela- 

 tive would seem to be B. pUcifera S. Wood, which differs, being larger, 

 with fewer ribs, and without the sharp spiral grooves which are the 

 most salient character of B. harpa. It is also differently jsroportioned, 

 with a relatively longer spire and smaller aperture. 



Bela krausei Dall. (PL IV, tig. 4.) 



I have a third species to add to the group to which the two previously 

 mentioned forms belong, and which is characterized by a fine, sharp, 

 but peculiarly appressed, sculpture. The present shell is the smallest 

 of the three. 



Shell small, elongate, ovate, compressed, with about six whorls and a 

 rather large smooth nucleus; tranverse sculpture of, on the last whorl, 

 about twenty- six broad flattened waves, strongly flexed, most elevated 

 over the fasciole, and becoming narrower and less prominent anteriorly; 

 the outer angle of the anal notch is rather prominent and makes an 

 angulation especially of the earlier whorls, which fall away in a pecu- 

 liarly flattened manner to the suture ; longitudinal sculpture of fine 

 sharp grooves, which pass uniformly over the ribs and interspaces, are 

 somewhat stronger on the earlier whorls and very uniform, only a little 

 coarser on the canal. The notch is more marked than usual in Bela; 

 the shell is pure white and the epidermis grayish yellow and quite 

 strong; length of shell 9.0, of aperture 4.7, width of shell 3.13™™. 



I am pleased to name this species, which has been in my hands some 

 twelve years, under a manuscript name which is now otherwise occu- 

 pied, to Dr. Arthur Krause, whose excellent work on the Bering Sea 

 mollusca is well known. This species is extremely rare ; the specimen 

 figured came from Port Etches, Alaska, where it was dredged on a 

 muddy bottom in fifteen fathoms, in 1874. 



Bela solida Dall. (PI. Ill, tig. 4). 



Shell solid, short, stout, with five strongly sculptured whorls and a 

 small smooth nucleus; color a faint blush of salmon covering the white; 

 epidermis very thin, smooth, and adherent; transverse sculpture of, on 

 the last whorl, thirteen stout, shouldered, prominent, rather sharply 

 rounded ribs, which pass over the periphery and disappear at the ante- 

 rior third of the whorl; they cross the anal fasciole with but little flexure, 

 but curve forward from the angulation (generally more decidedly than 

 the figure indicates), at which they are somewhat swollen, with about 

 equal interspaces; longitudinal sculpture of numerous equal uniform 

 grooves, with convexly rounded subequal interspaces, faint on the anal 

 fasciole, but covering the rest of the shell with remarkable uniformity, 

 averaging five or six to the space of a millimeter ; one or two stronger 

 ones follow the angulation of the whorl, but not prominently; pillar 

 stout, white; anal notch obsolete ; operculum short, broad, thin, yellow- 



