180 
C. Ventricosa. F. p. 307.—Tuxrto VENTROSA. 
Mont. p. 317. t. 12. f. 13.—D. p. 840.—Lin. T. 8. 
p. 164.—Dor. Cat. p. 49. t. 18. f. 12a.—T. Exur- 
nEus. Adams. t. 14. f. 15.—Walk. f. 36.—Smooth, 
glossy, thin, with six much rounded whorls, light pel- 
lucid horn-colored (appearing black when the animal is 
present); apex moderately pointed; aperture suborbi- 
cular, closed by a thin wrinkled corneous operculum, 
margin almost entire the whole way round. ...0,04. 
Kent, &c. 
C. Auricutaris. F. p. 307.—Turspo a. Mont. p. 
308.—D. p. 844.—Lin. T. 8. p. 166.—Conic,smooth, 
subpellucid, light horn-colored ; whorls five, much 
rounded and deeply divided by the suture; apex 
moderately pointed and usually darker; aperture sub- 
oval or ear-shaped; outer lip thin; inner much re- 
flected, forming an angle about the middle behind 
which is a narrow umbilicus. §...0,217. Southampton. 
C. Utve#. F. p.308.—Turso U. Pen. p. 1382. t. 
86. f. 120.—Mont. p. 318.—Da Cos. p. 105..— D. p. 
840.—Lin. T. 8. p. 104.—Dor. Cat. p. 49. t. 18. f. 
12.—Opaque,dark or rufous brown, the apex moderately 
pointed ; whorls five to seven, nearly flat, the suture 
small; aperture suboval, inner lip reflected on the 
