MONODONTA. 



umella is much more superficial than in M. canalifera. T. parvus- 

 Trosch. (pi. 34, fig. 27) seems to be identical. 



Var. ATRAMENTARIA Fischer. PI. 62, fig. 86. 



Blackish or blackish-green ; more distinctly spirally grooved than 

 the type ; lip and columella green-bordered. 



M. DAMA Philippi. PI. 21, fig. 24 ; pi. 22, fig. 38. 



Shorter, more globose than M. labio ; nearly smooth ; whorls 

 about 5 ; spire short, more or less elevated, the apex eroded ; follow- 

 ing whorls convex ; sutures linear, impressed ; color cinereous, en- 

 circled by spiral series of narrow purplish or brownish oblong mark- 

 ings ; surface covered with minute narrow spiral ridges, scarcely 

 elevated above the surface ; body- whorl large, globose, a little flat- 

 tend below the suture, then convex ; aperture large, oblique ; outer 

 lip finely plicate within ; columella short, ending in a smooth, but 

 slightly salient basal tooth ; middle of the columellar area with a deep 

 curved groove from the place of the umbilicus downward, the groove 

 extending upon the basal lip as a submarginal sulcus ; basal notch 

 or canal not deep, nor dentate in the middle ; basal lip subplicate 

 within. Alt. 20, diam. 20 mill. ; alt. 29, diam. 27 mill. 



Red Sea; Suez; Gulf of Akabo. 



Trochus dama PHIL,., Zeitschr.f. MaL 184:8, p. 105. Conchyl. Cab. y 

 p. 233, t. 35, f. 6. FISCHER, Coq. Viv. t p. 360, t. Ill, f. 2. 



Distinguished by the fine, sometimes obsolescent surface sculpture, 

 the narrow articulated color-pattern, and especially by the semilunar 

 sulcus upon the center of the columellar tract, which does not 

 terminate at the basal notch but is continued upon the lip as a more 

 or less obvious groove. This sulcus is in an entirely different place 

 from that of M. canalifera, which is short, parallel to the edge of the 

 columella, and straight. 



M. VERMICULATA Fischer. PI. 21, figs. 25, 26 ; pi. 62, fig. 64. 



Shell imperforate, solid, thick, subglobose; spire conoid, short; 

 whorls 4 to 5, the penultimate and last quite convex, the last 

 descending, more or less concave just below the linear suture ; young 

 shells obsoletely spirally lirate, the sculpture disappearing with age; 

 coloration consisting of numerous narrow red or orange zones alternat- 

 ing with bands of light green articulated with black ; aperture 

 oblique, round-ovate ; outer lip finely plicate within ; basal lip 

 thickened, plicate ; columella short, terminating in an acute tooth ; 



