obtuse longitudinal striae ; greyish white, pale rufous 

 or green, with a white tip. If. Cornwall and Devon, 

 very rare. 



D. LABIATUM. Turt. D. p. 38. Nearly cylindrical, 

 very slightly tapering and curved, semi-transparent, 

 ivory white, covered, when fresh, with a black glossy 

 skin, most finely and minutely striated longitudinally ; 

 open at the larger extremity, the smaller end truncated, 

 with the flattened surface somewhat undulated in a 

 radiate manner, and finely striated circularly, from the 

 centre of which projects an oval transparent process or 

 lip, terminating in an oval aperture one side of which 

 is cloven half-way down. 1|. Torbay. Breadth at the 

 open end, one fifth. 



D. LEVE. Turt. D. p. 256. and POLITUM. p. 38. 

 Somewhat cylindrical, slightly tapering and a little 

 curved, semi-transparent, quite smooth and finely po- 

 lished, white, with generally some irregular grey circular 

 bands which grow darker and more combined together 

 towards the narrower extremity ; both ends open, the 

 smaller very obtuse, not truncated, but rounded, with 

 an oval perforation. I. Torbay, very rare, not unlike 

 the last. Breadth at smaller end,^, at the larger, 0,20. 



D. SEMISTRIATUM. Turt. D. p. 39. /. 68. Very 

 slender, tapering to a very fine point, glossy, transpa- 

 rent, a little curved, open at both ends, quite smooth on 



A2 



