OF CONCHOLOGY. 99 



eight evenly rounded whorls ; aperture less than half and more 

 than a third as long as the shell, rather narrow ; outer lip thin, 

 sharp ; columella straight, with a slight callus ; canal short, 

 wide, very slightly recurved ; sutural sinus obsolete. Sculpture 

 of almost imperceptible revolving lines, crossed by oblique 

 longitudinal ribs, waved near the suture and obsolete on the 

 lower half of the whorl. Lines of growth irregular, quite evi 

 dent ; epidermis thin, olivaceous ; whorls slightly shouldered ; 

 nucleus and first few small whorls whitish ; nucleus smooth, 

 obliquely bent, minute ; suture deep, impressed ; a slight callus 

 on the columella. Interior of the aperture polished, smooth, 

 fuliginous. Ribs rather strong on the upper whorls. Lon. -8, 

 lat. -3 in. Defl. 40°. 



Habitat, Unga Island of the Shumagin group, in the North 

 Harbor, four fathoms, muddy bottom ; one specimen living ; 

 Dall, 1866. 



This shell may possibly be a Bela, though the whorls are not 

 cancellated, the columella not flattened, and the shell hardly 

 turrited. I have compared it with the North European forms 

 of Bela and with all the types of the West Coast species of 

 Mangelia in the Smithsonian collection, and find nothing which 

 resembles it. 



Mangelia aleutica, n. s. 



Shell pure white, elongated, acuminated, of seven whorls 

 carinated above, though not very strongly. Aperture narrow, 

 long, two fifths the length of the shell ; outer lip sharp, thin, 

 strongly flexuous, produced below, sinus close to but not on 

 the suture, not very deep or prominent ; canal one-third as 

 long as the aperture, straight, narrow; columella smooth, almost 

 straight, without callus ; nucleus smooth white, pointed, drawn 

 out ; sculpture consisting of longitudinal ribs thirteen or four- 

 teen on the last whorl, obsolete on the lower third of the whorl 

 and not extending to the suture, below which is a smooth band 

 only marked by oblique lines of growth ; ribs slightly nodulous 

 at their posterior terminations (where they are united by a 

 slight carina) strong on the upper whorls, slightly flexuous on 

 the convexity of the whorl. Whorl below the carina marked 

 by very faint grooves close together and passing over the ribs, 

 stronger at the anterior end of the last whorl. Lon. -68, Lat. 

 •24 in. Defl. 35°. 



Habitat, with the last ; three specimens, Dall, 1866. 



This species has relations with 31. angulata and M. erebricos- 



