190 CHLOROSTOMA. 



This shell seems to be a true Chlorostoma, or rather, Omphalias. 

 Its distribution is very different from that of any other species, and 

 its characters also are distinct. The dark coloration, white-dotted 

 narrow lir^e, concave base, etc., are diagnostic. 



C. cANus Koch. PI. 61, figs. 14, 15. 



Shell small, umbilicated, globose-conoidal, solid, smooth, gray ; 

 whorls nearly flat, depressed above, the last rounded ; aperture nar- 

 row within ; columella arcuate, with an acute basal denticle and a 

 deep sulcus below ; umbilicus narrow. (Phil.) 



The shell is globose-conical, somewhat depressed, and consists of 

 5 to 6 whorls ; the superior ones are flat, especially at the suture; 

 the last is well rounded at the pei'iphery ; all are smooth ; the shell 

 is very thick, so that the aperture appears small within ; it is cir- 

 cular; the concave columella ends in a sharp tooth, bounded by a 

 deep furrow which is parallel with the outer lip. The inner lip is 

 thickened, especially toward the umbilicus, which is very narrow 

 but perforating. The color is gray, without markings. The neigh- 

 borhood of the umbilicus is white. Alt. 7, diam. 9 mill. {PhUippi.) 



West Indies. 



T. canus Koch, Zeitschr. f. Mai. 1848, p. 102; Philippi, 

 Conchyl. Cab., p. 181, t. 28, I 9. 



C. OMPHALiUM Philippi. Pi. 61, figs. 5, 6. 



Shell umbilicated, conoidal, granose, painted with deep purple 

 ilanies ; whorls slightly convex, the last angulated at the circum- 

 ference, with 5 to 6 granuliferous cinguli, slightly narrower than 

 the interstices ; base rather flattened, with 5 slightly elevated 

 cinguli articulated with purple ; aperture rounded-rhombic ; colu- 

 mella cut out, produced into a green lobe partly surrounding the um- 

 bilicus, below denticulate; lip where it passes into the columella, 

 simple. (Phil.) 



The shell is depressed conoidal, consisting of 6 whorls, of which 

 the upper ones are scarcely c(mvex, the last angular at the periphery 

 and flat beneath ; last whorl showing 5 to 6 rows of flat, rather dis- 

 tant granules, which are narrower than the interstices; the base 

 shows 5 or 6 very slightly elevated, smooth, concentric lirie, with- 

 out granules. The umbilicus is cylindrical in each whorl, with a 

 white spiral keel within. The aperture is somewhat depressed, 

 rhombic-circular ; the columella excavated, prolonged in a green 

 lobe above, partially surrounding the umbilicus. The basal mar- 



