168 CHLOROSTOMA. 



base ; columella dentate in the middle, expanded above in a white 

 callus ; umbilicus profound, circular, surrounded by a white zone. 



Alt. 30, diam. 33 mill. 



Japan. 



Trochus pfeifferi PHILIPPI, Zeitschr. f. Mai, 1846, p. 104, and 

 Conchy 1. Cao., p. 152, t. 25, f. 2. LISCHKE, Jap. Meeres- Conchy!., p. 

 98. FISCHER, Coq. Viv., p. 336, t. 105, f. l. T. nordmanni 

 SCHRENCK, Bull, de I'Acad. de St. Petersb., v, p. 511 (1862) ; Nord- 

 jap. Moll., p. 349, t. 15, f. 1,2; Relsen u. Forschungen Amur-Lande, 

 p. 349, t. 15, f. 1, 2. Chlorostoma achates OLD., Proc. Bost. Soc. N. 

 H., viii, p. 20. (1861.) 



The typical C. pfeifferi is strictly conical, with nearly straight 

 lateral outlines ; the whorls are obsoletely longitudinally plicated ; 

 the base is slightly concave, and radiately striate or streaked with 

 white. Var. ACHATES Gould, differs in having a smooth surface, 

 the folds entirely obsolete. 



C. CARPENTERI Dunker. PL 25, figs. 5, 6, 7, 8. 



Shell umbilicate, conical, solid, grayish-black, but seen on close 

 inspection to be minutely, densely striped with black on a whitish 

 ground; spire strictly conical, apex yellowish; whorls 6 to 7, flat, 

 densely, very obliquely sublamellose-striate, and with coarse, wavy, 

 irregular longitudinal folds over the entire upper surface ; last 

 whorl acutely carinated at the periphery ; base plano-concave, with 

 about four strong spiral lirse ; aperture extremely oblique, columella 

 strongly dentate in the middle, expanded above and reflexed partly 

 over the umbilicus; umbilicus white within, spirally ribbed. 



Alt. 26, diam. 25 ; alt. 54, diam. 43 mill. 



Nagasaki and Decima, Japan. 



Trochus carpenter i DUNKER, Malak. BL, vi, p. 237 (1860) ; and 

 Moll. Japonica, p. 21, t. 3, f. 12. LISCHKE, Jap. Meeres- Conchy I., 

 p. 98, t. 7, f. 8, 9, 10. FISCHER, Coq. Viv., p. 170, t. 57, f. 1. 



More coarsely sculptured than any other Japanese species. 



Species from the West Coast of the Americas. 



C. PELLISSERPENTIS Wood. PL 20, figs. 1, 2. 



Shell imperforate, conical, elevated, very thick, solid and heavy ; 

 color yellowish or pinkish, marked with narrow angular patches or 

 interrupted longitudinal oblique stripes of black ; spire strictly 

 conical, apex acute, sutures linear ; whorls 8, encircled by weakly 



