TROCHUS. 67 



spiral strise often a little difficult to distinguish ; this gives the inter- 

 stices at times a granulate appearance under the lens. The aperture is 

 nearly horizontal, tetragonal ; superior lip straightened, bearing a 

 very large sub-bifid squarish tubercle in the middle ; place of the 

 periphery marked inside by an entering lamellar fold ; basal margin 

 curved, slightly expanded, bearing two or three fold-like denticles 

 inside, edge minutely denticulate ; columella oblique, deeply enter- 

 ing the narrow umbilicus and inserted in the center of the axis, 

 slightly dentate above, bearing a narrow tooth below the middle, 

 and terminating in a large, heavy bi- or triplicate tooth ; parietal 

 area covered by a white callous bearing numerous wrinkles, one or 

 two of which enter the aperture ; umbilicus surrounded by a radiately 

 strongly plicate callous. Coloration as in T. clanguloides. 



Alt. 12, diam. 13 ; alt. 11, diam. 11 mill. 



Red Sea. (Dr. Beadle.) 



On old specimens the compression and deflection of the last whorl 

 gives the shell a bullet shape. The aperture is like stigmatarius, 

 coloration and sculpture like clanguloides. In this combination of 

 characters the species is quite distinct. Similar specimens marked 

 Lord Howlands Id. are before me. The species is named in honor 

 of Mr. S. RAYMOND ROBERTS, author of the Monograph of Cyprseidte 

 in the MANUAL. 



T. LARGILLIERTI Philippi. PL 11, figs. 51, 51. 



Shell perforate, conoid, apex acute; whorls 6J, the first rosy, 

 following whorls convex, grayish, spotted with white and black at 

 the narrow sutures ; spirally lirate, lira? granulose, numerous, 8 to 

 10 on the penultimate whorl ; last whorl rounded, concentrically 

 lirate beneath, lime 8 to 10, gray and brown articulated ; aperture 

 oblique, rhomboidal, lip dentate above ; basal margin plicate, colu- 

 mella oblique, dentate at base ; parietal callous wrinkled ; umbilicus 

 bordered by strong white plica?. Alt. 14, diam. 16 mill. (Fischer.) 



Habitat unknown. 



T. largillierti PHIL., Zeitschr. f. Mai. 1848, p. 109. Conchyl. Cab. 

 p. 265, t. 39, f. 6. FISCHER, Coq. Viv., p. 216, t. 71, f. 3. 



T. FLOSCULUS Fischer. PI. 11, figs. 56, 57. 



Shell narrowly perforate, conoid, thick, apex acute ; whorls 7 J , 

 the first rosy, smooth, the rest convex, separated by linear sutures, 

 spirally lirate, the lime granose, 6 on the penultimate whorl, of which 

 the 1st, 3d, 5th are entirely reddish, the 2d, 4th, 6th composed 



