MOXODONTA. 113 



M. TiGRiNA Chemnitz. Tl. 23, figs. Gl-64. 



Shell conoidal, more or less elevated, imperforate, lusterle.ss black- 

 ish or purplish, unicolored or with a few scattered white dots, or 

 yeUowish flexiious lines ; spire conic, ai)ical whorls eroded, yellow or 

 wdiitish ; whorls about 6, spirally coarsely but obsoletely Urate; 

 aperture large, oblique, black-bordered, silvery within ; columella 

 simple, white or yellowish, bordered by a dull purplish streak ; parie- 

 tal wall usually covered by a thin silvery callous. 



Alt. 27, diam. 32 mill. 



Cape Region, S. Afi-ica. 



Trochus tigrlnus Chemnitz, ConclujI. Cab., v, p. 53, f. 15H6. — ■ 

 PHiLrppi, Conchyl. Cab.,' p. 27, t. 6, f 5. — Fischer, Coq. Viv., p. 

 174, t. 5S, f. 1. 



In form like M. merula ; but without the rosy base, more coarsely 

 and obviously spirally lirate, and usually dotted with white. 



Var. VAScoi Fischer. PI. 23, figs. 62. 



Shell with acute spire ; deeply spirally sulcated, the penultimate 

 wdiorl five-lirate; aperture less dilated. Alt. 33, diani. 31 mill. 



M. SAUciATA Koch. PI. 24, figs. 95, 96 ; pi. 21, figs. 31, 32 ; pi. 62, 

 figs. 81, 82. 



Shell low-conical, imperforate, rather thin ; ground-color greenish, 

 especially on the last whorl, usually purplish on the spire, and either 

 (1) spirally encircled by bands of dark green, black, or red oblong 

 spots articulated with a lighter color, or (2) obscurely mottled with 

 reddish, the ground-color covered with fine oblique or zigzag lines ; 

 the pattern sometimes so obscurely mottled, spirally and obliquely 

 streaked, that it appears nearly uniform olivaceous, especially on the 

 last whorl ; spire more or less elevated, conic, the apex minute, 

 acute, reddish, when not eroded ; sutures well impressed ; whorls 6, 

 spirally more or less obviour^ly, finely, irregularly striate or lirate ; 

 body-whorl rounded or subcarinated at the peri})hery ; base some- 

 what convex, more or less impressed around the axis, sometimes 

 eroded in front of the aperture ; aperture large, very oblique ; outer 

 lip with a black-spotted green edge, which is generally followed by 

 a broad thin opaque-white band, within which it is nacreous and 

 iridescent ; columella oblique, thin-edged, the edge convex in the 

 middle ; columellar area white, more or less eroded ; umbilical tract 

 covered by a thick pad of enamel. Alt. 20, diam. 24 mill. 



Madeira; Mogador ; N.Spain; Cape Verde Is. ; Canary Is. 



