CALLIOSTOMA. 347 



series of fine short folds ou each side ; three last whorls with a 

 median series of tubercles ; aj^erture almost half the entire altitude; 

 last whorl encircled by an acute compressed carina at the base ; base 

 very convex, with 8 narrow crenulated spiral lirse, the first 3 

 separated, the rest closer ; aperture rounded-subquadrate ; columella 

 sinuous, brilliantly pearly. Alt. 43, diam. 30 mill. (Lischke.) 



Jedo, Japan. 

 Trochus argenteo-nitens Lischke, Jap. Meeres-Conchyl. iii, p. 66, 

 t. 4, f. 1, 1874. 



A handsome and distinct species. 



C. CONSORS Lischke. PL 63, figs, 22, 23. 



Shell broadly conical, apex acute, imperforate, rather thin, en- 

 circled by very many narrow, unequal, subtly granulose or cren- 

 ulated riblets, as wide or narrower than the interspaces ; pale tawny, 

 flamed with deeper color, and articulated on the liblets with dark 

 dots ; whorls 8, separated by a suture not profound, mai'gined, acutely 

 angled in the middle ; last whorl wide, furnished with another angle 

 on the base ; base convex, multi-lirate ; aperture rhomboid-orbicular ; 

 columella arcuate, pearly, bordered outside by a semilunar pit ; 

 throat obsoletely sulcated, nearly smooth. 



Alt. 25, diam. 24 mill. (Lischke.) 



Jedo, Japan. 



Trochus consors Lischke, Jaj). iNIeeres-Conchyl., p. 65, t. 4, f. 2, 

 3, 1874. 



C. MONiLiFERUM Lamarclv. PI. 63, fig. 17. 



The typical form of this shell is known to me only by the figures 

 cited below. Fischer I'epeats Lamarck's diagnosis. The T. ahcince 

 of Lischke (pi. 63, figs. 15, 16) differs somewhat in the contour of the 

 columella. The following description is translated from Lischke's : 



Shell broad conic, oblique, apex acute, rather thin, whitish, with 

 a silvery sheen from the underlying pearly layer ; whorls 8, nearly 

 flat, encircled by very numerous very finely granose riblets, and in 

 the middle by a series of equidistant tubercles ; the suture has a 

 series of numerous little tubercles close above it, and beneath it a row 

 of short oblique folds ; last whorl equaling about two-fifths the total 

 altitude, sub-bicarinated by two series of tubercles ; base scarcely 

 convex, sculptured by numerous granose spiral riblets, cut by incre- 

 mental stride ; umbilicus narrow, nearly covered by a plate-like 

 dilation of the columella, and bounded outside by a porcelain-white 



