44 TESTACEOUS MOLLUSCA. 
A. CorruGcatum. Sow. Z. P. 1832. Sub-orbicular, whitish, 
longitudinally striated and concentrically wrinkled ; epidermis 
fuscous, ako ace dorsal margin straight and inclined : within yel- 
lowish. 1..2,1,.—Peru. 
A. eee Son. Z. P. 1832. Reeve t. 47. f. 4.—C. I. 
Jf. 4. Sub-orbicular, rounded, concentrically wrinkled, whitish 
with at times pink rays. 3.— New Holland. 
A. Rurium. Son. Z P. 1832.—C. I. f. 10. Sub-oval or 
sub-orbicular, rather irregular, white with sometimes a few rays near 
the margin, radiatingly striated, concentrically wrinkled by inter- 
rupted ribs but smooth at the umbones ; inside white, the lateral 
teeth rather close, short, thick, and as well the anterior dorsal 
margin, purple. $3..114. Pacific. 
A. Lave. Sow. Z. P. 1832. —Reeve, t. 48. J. 6.—C. I. 
Jf. 5. Ovate, white, smooth under a thin horn-coloured epidermis, 
anteriorly shorter and rounded, posteriorly longer and sub-acumi- 
nated : an obsolete anterior sulcus running from the umbo to the 
ventral margin. 315..1,%.—W. Columbia. 
A. Purpurascens. Sow. Z. P. 1832. (not Lam.)— Reeve 
t. 48. f.5.—C. I. f. 5. Oval, purplish, posteriorly rounded, an- 
teriorly sub-acuminated, sub-truncated, anterior dorsal margin 
straightish and crenulated, with acute concentric, very crowded, 
thin, fulvous and crenulated ribs. 43..149,—W. Columbia. 
A. Formosum. Sow. Z. P. 1832. Reeve. t. 41. f. 8.— 
C. I. f. 8. Oval, whitish with rosy rays, purple spots, and concen- 
tric crowded ribs, which are wrinkled at each extremity : umbones 
yellowish within. =7,..2.—W. Columbia. 
A. Pautipum. Som. Z. P. 1832.—Reeve. t. 47. f-3.—C. I. 
J. 3. Oval, pale purplish, fulvous, darker at the umbones, a thin 
rather irridescent epidermis, with delicate eee strize : ante- 
riorly truncated, dorsal margin rounded. =°,..14.—W. Columbia. 
A. Rosrum. Sow. Z. P. ia en carve Ff. 1.—C. I. 
Jf. 1. Sub-orbicular, under a brown glossy epidermis, rosy, con- 
centrically ribbed, anteriorly sub-emarginated, the ribs crowded and 
acute. 1=1,.. 24. 
A. Lenticutare. Sow. Z P. 1832.—C. I. f. 9. White, 
lenticular, smooth, with delicate radiating striz, which centrally and 
posteriorly are decussated by other sub-concentric and flexuous 
ones; anterior margin sub-flexuous; epidermis very thin and 
yellowish. 44..5% —W. Columbia. 
A. Rusrouneatum. Conr. Jour. A.N.S. Phil. fo Ps (239. 
t. 18. f. 11. Sub-triangular, moderately thick ; anterior side nar- 
rowed, folded, truncated at its extremity ; beaks central: yellowish 
with pale red rays: depressions purple: inside tinged with purple in 
the middle, lateral teeth distinct. 1.—U. California. 
A..Decisum. Conr. Jour. A. N.S. Phils]. p. 239. ¢.19.f. 2. 
