150 
Mont. in Iin. T. 11. p. 186. t. 12. f. 5,6.—More 
depressed and opaque than the preceding. Devon. 
Grenus.—HALIOTIS. 
Har-shaped, usually depressed ; spire very short, some- 
times depressed and sublateral ; aperture extremely 
dilated, ovate-oblong and, when perfect, entire : 
disc, with perforations disposed in a line running 
parallel to the left margin. 
H. Tupercurata. Lin. 1256.—List. ¢. 611. f. 2. 
—Knorr.1.t.17. f.1.—Mart. f. 148,9.—D. p. 1009. 
—Pen. 4. p. 141. t. 88. f. 144.—Don. t. 5.—Mont. 
p. 473.—Dor. Cat. p. 57, t. 22. f. 1,2.—Da Cos. t. 
2. f. 1,2.—Ovate-oblong, depressed convex, spirally 
striated, with irregular longitudinal more or less distinct 
rather distant folds ; brownish outside, often variegated 
with green, beautifully irridescent within; apex with a 
single spiral turn, slightiy produced, umbilical cavity 
very small; inner lip inflected. 3. Guernsey. 
TriBE.—PLICACEA. 
Shell with plaits on the pillar, and the aperture 
narrow. 
GeNus.—TORNATELLA. 
Convolute, oval-eylindrical (usually striated transversly 
