240 
body equally on both sides and furnished with a small 
perforation. Sandwich, §e. minute. 
P. Levietuta.—Navtitus L. Mont. p. 188. § 
Sup. p.: 175. . 18. f. '7,°3-—Turt. D. p. 118-—D. 
p. d41.—F. p. 228,—Lin. T. 8. p. 115. (Walk. t. 3. 
Sf. 67.—Adams. t. 14. f. 32.)—Glossy, smooth, the 
partitions marked by subelevated flexuous rays, exte- 
riorly subcarivated, sides convex ; mouth triangular 
with a rim which does not clasp the body whorl; aper- 
ture near the discal edge: chambers about ten. 
England and Scotland. minute. 
D. Depressuta.—Macg. Aberd. p. 318.—Nav- 
Titus D. Mont. p. 190. & Sup.p. 78. ¢.18. f. 9.— 
Lin. T. 8. p. 115.—Turt. D. p. 118.—Walk. t. 3. 
f. 68.—Adams. t. 14. f. 63.—D. p. 341.—F. p. 228. 
Depressed, exteriorly rounded, the chambers and parti- 
tions nearly even, about nine, the latter slightly curved 
and ending at the centre ina pellucid spot. England 
and Scotland. minute. 
P. UmpinicaTuLa. Macg. Aberd p. 317.—Navti- 
Lus. U. Mont. p.191.& Sup. p. 78. t. 18. f. L— 
Turt. D. p. 119.—Walk. t. 3. f. 69.—F. p, 229.—D. 
p. 343.—Lin. ¢t. 8. p. 115.—Depressed, exteriorly 
