CHLOROSTOMA. 189 



C. SUBFUSCESCENS Schrenck. PL 41, figs. 18, 19, 20, 21. 



Shell small, depressed-conoidal, narrowly umbilicated, brownish- 

 black, unicolored or marbled with dull white, encircled by slightly 

 elevated lines, densely decussated by oblique striae ; whorls 4, plan- 

 ulate, the upper subaugular at the suture, the last bicarinate at the 

 periphery, transversely costulate-plicate above ; base nearly flat, 

 very minutely closely striate ; aperture rhomboidal, columella arcu- 

 ate, with two small teeth separated by a little pit below, above 

 produced into a lobe partly covering the umbilicus ; lip acute, brown- 

 margined ; fa'uces pearly, white. 



Alt. 7, diam. 10 mill ; alt. 5, diam. 7 mill. (Schrenck.) 



Bay of Hakodadi, Japan. 



T. subftiscescens SCHRENCK, Bull, de 1'Acad. Imp. des Sci. de St.- 

 Petersb., v, p. 512 ; Moll, des Amur-landes, etc., p. 350, 1. 15, f. 3-10. 

 This species is evidently closely allied to Trochus sordidus Phil. 



. PFEIFFERI Dohrn. PI. 61, figs. 28, 29. 



Shell umbilicate, conical with concave base, solid, lusterless, dark 

 blackish or purplish slate-colored, with spiral series of white dots ; 

 spire conoidal, apex blunt, sutures subcanaliculate ; whorls about 

 5, convex, the last subangulate at periphery, and with a decided 

 angle in the center of the base ; the sculpture consists of narrow in- 

 conspicuous spiral riblets (about 6 on penult, whorl) articulated 

 with white dots. The whole surface has oblique growth lines; and 

 a lens shows fine, subobsolete spiral striae all over the upper surface. 

 Inside of the angle on the base the color is greenish, with radiating 

 dull reddish stripes, and the surface smooth, save for five growth- 

 lines. Aperture large, occupying one-half the area of base, sub- 

 horizontal, pearly within, with red and green reflections, the nacre 

 either almost smooth or bearing fine white opaque plica? ; outer lip 

 thin, bordered within by an opaque white band about \l or 2 mill. 

 wide ; columella very oblique, straight, white, opaque, continued 

 in a callous lobe about 2 around the umbilicus. 



Alt. 10, diam. 12 mill. 



New Hebrides. 



Omphalius pfeifferi DOHRN, Malak. Bl. 1864, p. 56. 



