78 
anterior end, which is shorter, smooth, and very ob- 
liquely truncated; yellowish olive, with two or three 
pale rays and darker or lighter bands ; inside violet, a 
single lateral tooth. #...1¢. Very common. 
D. Denticunata. Lin. 1127.—D. p. 151.—Lam. 
00.—Ch. f. 256.—E. M. t. 262. f. 7.—F. p. 433.— 
Pen, 4. p. 199. #. 58. f. 2.—Mont. p. 104.—Lin. T. 
8. p. 76.—Turt. B. p. 124.—Dor. Cat. p. 34. t. 5. 
f. 12.—Turt. C. D.p. 41. f. 19.—D. Crenvurata. 
Don.t. 24,— Ovate wedge-shaped, very obtuse anteriorly, 
with numerous fine punctured radiating strize, white 
with purple rays ; anterior slope wrinkled transversely ; 
inside purple, margin denticulated. 0,58...3. Not 
very COMMON. 
** Margin plain. 
D. Compranata. Mont. p. 106. ¢. 5. f. 4.—Lin. T. 
8. p. 75.—Pen. 4. p. 198.—Dor. Cat. p. 34.—D. p. 
150.—Turt. C. D. p. 42.—Turt. B. p. 125. t. 7. f. 
13,4.—F. p. 435.—TeEtiina Portta. Poli. 2. ¢. 21. 
f. 14,5.—Capsa C. Sow. G. f. 8.—Oblong, anteriorly 
obliquely but obtusely truncated, posteriorly rounded 
but attenuated, smooth, whitish, under a greenish epider- 
mis and marked posterierly with a single broad whitish 
