TROCHUS. 71 



wide as the ridges, basal line finer, closer, more minutely granose ; 

 last whorl bluntly angulate at the periphery, slightly convex beneath, 

 slightly deflected anteriorly ; aperture oblique ; outer and basal lips 

 curved, with a plicate thickening or rib within, and a small pliciform 

 denticle above ; columella very deeply inserted in the narrow, pro- 

 found umbilicus, its middle portion subdentate, terminating below in 

 a strong tri-plicate tooth ; umbilicus with a strongly crenulate 

 marginal rib. Alt. 7, diam. 7 mill. 



Ceylon. 



Clanculus ceylanicus G. and H. NEVILL, Journ. Asiatic Soc. 

 Bengal, xxxviii, 1869, p. 157, t. 17, f. 7. FISCHER, Coq. Viv., p. 

 303, t. 96, f. 3. 



A small brown-radiate species, somewhat similar to T. clangu- 

 loides in form. The more characteristic marks, aside from form and 

 coloration, are the narrow, deep umbilicus, with centrally inserted 

 deeply entering columella, the large, trifid basal tooth, and the 

 number of granose spiral ribs, which is fewer than in allied forms. 



T. THOMAS: Crosse. PI. 10, figs. 14, 15. 



Shell conic-globose, umbilicate, maculate with white on a ground 

 of reddish carmine ; whorls 5, convex, spirally traversed by five very 

 finely granulose lirse, the first two small, third larger, fourth small, 

 fifth larger than the others ; suture profoundly impressed, canalicu- 

 late, last whorl with 8 lirse on the base encircling the umbilicus ; 

 columella unequally bidentate, the basal tooth larger, compressed ; 

 lip at base obsoletely denticulate, elsewhere edentulous ; aperture 

 oblique, less ringent than most species of Clanculus, fauces sulcate, 

 nacreous ; umbilicus white, in young shells smooth, in adults ob- 

 soletely crenulated. Alt. 6-62, diam. 62 mill. (Fischer.) 



Is. Art, Nei.v Caledonia. 



Clanculus thomasi CROSSE, Journ. de Conch, x, 1862, p. 405, t. 13, 

 f. 4. T. thomasi FISCHER, Coq. Viv., p. 321, t. 101, f. 1. 



A variety is olivaceous green, maculate with white, the apex rosy. 



It is a small species, with very prominent, compressed basal tooth, 

 and slight crenulations at the margin of the umbilicus, the right lip 

 not dentate. 



T. SATRAPIUS von Martens. PL 39, figs. 25. 



Shell conoidal, umbilicate, granulate-cingulate, cinguli unequally 

 elevated, smaller ones interpolated, numbering 5 to 6 between suture 

 and periphery, 7 to 8 on the base of the last whorl ; periphery 



