240 GIBBULA. 



Has the aspect of G. richardi on the base, but is more narrowly 

 umbilicated and has smaller, less oblique aperture. The ledge on 

 the periphery is like that of O. magus, G. albidus, and other species 

 of the typical group. The color is sometimes pale purplish red; 

 mottled with light green, and with broad subsutural darker flames, 

 sometimes it seems nearly unicolored crimson above. The mottlings 

 will however be seen under a lens. The base is always lighter 

 colored. The principal peculiarity of sculpture is the fold-like 

 oblique striation, and the very dense microscopic striation of the 

 whole surface. 



G. MULTICOLOR Krauss. PI. 62, fig. 83. 



Shell small, narrowly perforated, conoidal , whorls 5, the first 

 whitish-rosy, the following white, with reddish flammules and spots of 

 green and bluish, especially at the ridges ; The surface of the whorls 

 is marked with very fine spiral and vertical striae, and 2 elevated 

 carinse ; last whorl tricarinate, base red with a spiral series of green 

 streaks, concentrically striate ; aperture suboval, smooth within ; 

 columella white. Alt. 6J, diam. 7 mill. (Fischer.) 



Cape of Good Hope. 



T. multicolor KRAUSS, Die Sudaf. Moll., p. 97, t. 5, f. 31. PHIL- 

 IPPI, Conchyl. Cab., p. 321, t. 46, f. 3. FISCHER, Coq. Viv. p. 316, 

 t. 99, f. 3. 



G. PONSONBYI Sowerby. PL 65, fig. 76. 



Shell subglobose, narrowly umbilicate, rather thin, pale, maculated 

 with brown at the base, whorls 5, convex, rapidly increasing, first 

 two smooth ; the rest angulated, coronated on the angle with a series 

 of tubercles, above the angle spirally tri-sulcate, below obscurely 

 lirate. Last whorl inflated, coronated with a series of (about 12) 

 tubercles ; below the corona uni-lirate, at base convex, ventricose, 

 rounded, furnished with about 8 rather acute line. Aperture semi- 

 lunar ; columella lightly callous, contracted above, turgid below the 

 middle. 



Alt. 13 i, diam. 14 mill. ; aperture, alt. 9, breadth 7 mill. (Sowb.) 

 In the absence of operculum it is impossible to say with certainty 

 to what genus or section this species belongs, though I have little 

 doubt it will prove a Gibbula. The base is unusually convex and 

 ventricose, the spire rather shortly conical, and the upper angle 

 coronated with rounded tubercles. The mouth is rather wide, and 

 the umbilicus narrow. The spiral ridges on the base are rather 



