the upper part, marked below with numerous lon gitudi- 
nal striz which are very distinct at the point, but grow 
fainter towards the middle, and at length totally disap- 
pear; clear white with a pale rufous tinge at the 
smaller end. 1,1. Breadth at larger end, 0,048. Dublin 
Bay. 
D. Imprerroratum. Walker. f. 15.— Mont. p. 496. 
D. p. 1068.— Adams t. 14. f. 8 —Turt. D. p. 39.— 
Lin. T. 8. p. 238—OrtHocERA. 7’. F.p. 237.—Slender, 
slightly curved, whitish, transversely striated, the 
larger end a little contracted at the margin, the smaller 
end closed and furnished with a-small round protube- 
rance. %. Kent and Cornwall. 
D. Crausum. Turt. D. p. 39.—Slender, slightly 
tapering, nearly straight, semi-transparent, horn colored 
or yellowish white, irregularly striated longitudinally, 
open at the larger end, with the opposite end closed and 
obtuse. 1. at larger end 4%. Calves Island, W. 
Ireland. 
D. Guasrum. Mont. p. 497.—Turt. D. p. 40.— 
Lin. T. 8. p. 239.—D. Minutum. D. p. 1068.—An 
Tin 1264? Cacum. G. Flem, Edin. Ene. 7. p. 67. €. 
204. f.7.—OrtHocera. G. F. p. 237.—Cylindric, 
arcuated, smooth, glossy, white, perfectly smooth ; 
aperture orbicular,, the other end closed, rounded, sub- 
marginated. 0,0833...0,0167. ‘Not uneommon at 
Biddeford Bay and Barnstaple, Devon. 
