BY VV. L. M.\r. 95 



about nine nodulous-like ribs, which become narrower and 

 weaker as they descend, and almost disappear on the body 

 whorl. There are a few faint spirals on the base. Aper- 

 ture rather broadly pyriform, oblique, surrounded by a 

 well-defined margin. 



Length 2. Breadth 0.9 mill. 



Type, with 20 others, from 40 fathoms, off Thouin Bay. 

 A very distinct form. It is remarkable that nearly all 

 the specimens taken have been injured by some predatory 

 mollusc. 



PI. VI., fig. 30. 



ALVANIA SUPRASOULPTA, Sp. Nov. 



Shell elongate, white or yellowish. Whorls five and a 

 half, rounded, suture well impressed ; protoconch, of one 

 and a half turns, smooth. Adult whorls four. The spire 

 whorls bear three spiral keels, about equally spaced. They 

 are crossed by numerous axials of about equal size and dis- 

 tance, forming square meshes, which latter are finely 

 spirally Urate ; small nodules are formed by the junction 

 of the keels. On the base of the body whorl are three 

 extra keels. Aperture rounded. Outer lip thickened 

 and scalloped by the keels. 



Length 2.4. Breadth 1.1. 



Type, from 40 to 50 fathoms, off Thouin Bay, with a 

 number of others. A beautifully sculptured little shell, 

 which appears to be undescribed. 



PI. VI., fig. 31. 



AMPHITHALAMUS TRIANGULUS, Sp. Nov. 



Shell small, brown, shining" pyramidal. Whorls four, 

 including a smooth, dome-shaped protoconch. The three 

 adult whorls are encircled by two rounded keels, one at the 

 suture and the other at the periphery. The upper one 

 is at first smooth, but develops nodules, which give it a 

 beaded appearance on the body whorl. The lower keel 

 is itself divided by a narrow groove. On the base are 

 three small keels. Aperture roundly-ovate, peristome 

 continuous, pointed above, forming a flattened ring, whilst 

 the opening itself is margined by a narrow, raised thread. 



Length 1.5. Breadth 1. 



Type, with twenty others, from 40 fathoms, off Thouin 

 Bay. 



PI. VI., fig. 32. 



