CALLIOSTOMA. 397 



light green, with white and dark dots articulating the ribs. There 

 is often a peculiar iridescence shining through the color. A white 

 form (" var. albino, Monts.") and a golden yellow one ('' var. aurea 

 Monts.), are found. 



This form has the peculiarly slender spire, sharply angular periph- 

 ery and flat base that seem to be characteristic of Calif ostoma from 

 the Gulf of Gabes. These modifications are shown by the var. 

 spongiarwn of C- laugieri, \ar.fraterculum of C. unidentatum, etc. In 

 fact, a number of these small species of Calliostoma seem to undergo 

 variations which produce parallel series in the several specific types. 



Var. ELENCHOIDES Issel. PI. 63, figs. 24, 25. 



Last whorl rounded at periphery ; surface apparently smooth, with 

 metallic reflections, but under a lens seen to be finely sculptured by 

 numerous spiral and oblique striae. Color very variable ; brown, 

 with zigzag white flammules, ashen gray, varied with bright rose and 

 irregular white spots, or fawn colored, with short white longitudinal 

 flames around the periphery, etc., etc. Resembles Elenchus in the 

 form and iridescent surface. 



C. GRAVING: Monterosato. PI. 63, figs. 28, 29. 



Spire moderately elevated, conical, composed of 7 flat whorls, 

 traversed by non-granulose lirse, about 6 on the penultimate whorl ; 

 the ridge immediately above the suture larger, more salient than the 

 others ; there are numerous spiral striae between thelirse, and several 

 on the supra-sutural ridge. Last whorl subangular at the periphery, 

 convex on the base, which is imperforate, and provided with a. very 

 small umbilical rimation ; the base has 5 concentric ribs. Suture 

 shallow. Aperture subquadrangular ; columella very slightly 

 arcuate, not truncate at base ; lip sharp, rounded, smooth inside. 

 Color white, with longitudinal flammules of reddish-brown; supra- 

 sutural ridge articulated with spots of the same, the other line dotted 

 with carmine ; columella white, interior nacreous. (B., D. & D,) 

 Mediterranean; Atlantic Ocean, at Orotava, Canaries. 



T. (Zizyphinus) gravince MONTS., En um. e Sinon., p. 22, 1878. 

 B., D. & D., Moll, du Rouss., p. 369, t. 43, f. 26-30. Jujubmus 

 gravities Monts., Nomencl. Gen. e Spec., p. 47. 



Less elevated than T. exasperatus, the last whorl less angular at 

 periphery, more convex beneath. The red-dotted lira? are also cha- 

 racteristic, and while appearing granulate they are really not so. 



