ACLIS. 87 



body Avhorl smooth. Length, 2*5 mill. 



N. Exirope, 



A. suPRANiTiDA, Searles Wood, PI. 17, %s.49, 56. 



Whorls 12, broader, and more rapidly increasing than in the 

 preceding species, distinctly umbilicated, surface vaiying from 

 smooth and glossy to several spiral ridges, obsolete or distinct, round 

 shouldered. Length, 6*25 mill. 



Europe, Madeira. 



A. Walleri, Jeffreys. PI. 18, fig. 65. 



Narrowly umbilicated, whorls 10, rather convex in the middle, 

 sloping above and below, with deep suture, shell very thin, trans- 

 parent, lustrous, with a few microscopic spiral striae. 

 Length, 3"5 mill. 



^V. Europe, Labrador, N. England. 



It is y1. Xisoides, Brugn. 



A. CARINATA, Smith. PI. 18, fig. 63. 



Whorls 9, slightly convex, with narrow spiral sulcations, the 

 periphery subacutely carinated ; soiled white. Length, 10 mill. 



Whydah, W. Africa. 



A. STRIATA, Verrill. PI. 18, fig. 70. 



Whorls 5, well-rounded, with deep suture, whitish, rimate, closely 

 spirally striated. Length, 4 mill. 



Near Eastport, Me. ; off Newport, R. I. 



A. TENUIS, Verrill. PI. 18, fig. 71. 



Very slender, Avhite, glossy, whorls 9, evenly rounded, nearly 

 smooth, with microscopic spiral lines or obscure angles on the lower 

 whorls, suture well impressed, umbilicus rimate. Length, 3*8 mill. 



Off Martha's Vineyard, Mass., 100 /hw. 



Section Hemiaclis, Sars., 1878. 



A. VENTROSA, Jeffi-eys. PL 16, fig. 93. 



White, whorls 8, well rounded, smooth, rapidly increasing, suture 

 well impressed, narrowly margined. Length, 6 mill. 



Lofoten. Isl. ; Bergen ; Mediterranean Sea. 



A. inflata, Mouts. is a synonym. 



