188 CHLOROSTOMA. 



divided by a sulcus, and broader than the interstices. The last 

 whorl has 15-16 such lir?e, and is almost cylindrical. The umbilicus 

 is pretty narrow, almost cylindrical, bounded by a prominent sharp 

 carina, which resembles a tooth-like projection of the columella. 

 Columella rather deeply excavated, but showing no trace of a con- 

 tinuation around the umbilicus. The aperture is somewhat rhom- 

 boidal, the outer lip thickened within, sulcate from the margin 

 inward, corresponding to the line of the exterior. One of my 

 examples is dark red, the other dark ashen-gray, both sprinkled with 

 white dots. Alt. 11-13, diara. 14-16 mill. {Philippi.) 



Habitat unhiown. 



T. cruentus Phil.. Abbild. u. Beschreib., i, Trochus, t. 4, f. 4 ; 

 Conchyl. Cab., p. 157, t. 25, f. 10. 



A species of uncertain generic position. May be a Gibbula. 



C. soRDiDUM Philippi. PI. 61, figs. 7, 8. 



Shell depressed-conoidal, narrowly umbilicate, transversely striate, 

 obliquely plicate, brown ; whorls depressed, carinated just above the 

 sutures, the last bicarinated ; aperture rhombic-orbicular ; columella 

 oblique, toothed in the middle, continued above in a lobe partially 

 surrounding the umbilicus. (Phil.) 



The shell is pretty thin, depressed-conoidal above, consisting of 6 

 whorls. The uppermost are level, with an elevated keel just above 

 the suture, below the keel perpendicular. The last wdiorl has a 

 second keel around the periphery. The base is plano-convex. The 

 part of the whorl above the keel shows about 6 elevated transverse 

 lines, and closely crowded growth stripe, under a lens appearing 

 lamellar; and on the last whorl are oblique Avave-like folds meeting 

 the incremental lines at right angles. The part between the keels 

 has 4 furrows; the base has smooth, close, concentric stride. The 

 aperture is broader than high, rhombic-circular; the outer lip thin ; 

 the throat smooth ; the columella is oblique, with a tooth in about 

 the middle, and above is prolonged in a lobe partly around the um- 

 . bilicus. The umbilicus is narrow, cylindrical, not definitely bounded. 

 The color is dirty brown, somewhat tinged with green. 

 Alt. 9, diam. 12 mill. (Philippi.) 



Habitat nnhjioivn. 



T. sordidus Philippi, Zeitschr. f. Mai., 1849, p. 191 ; Conchyl. 

 Cab., p. .301, t. 44, f. 1. 



