44 TESTACEOUS MOLLUSCA. 



A. Corrugatum. Sow. Z. P. 1832. Sub-orbicular, whitish, 

 longitudinally striated and concentrically wrinkled ; epidermis 

 fuscous, anterior dorsal margin straight and inclined : within yel- 

 lowish. 1 . . 2 y L. — Peru. 



A. Australe. Sow. Z. P. 1832. Reeve t. 47. f. 4.—C I. 

 /. 4. Sub-orbicular, rounded, concentrically wrinkled, whitish 

 with at times pink rays. \. — New Holland. 



A. Rupium. Sow. 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. \ % . . 1 \. — Pacific. 



A. L^ve. Sow. Z. P. 1832.— Reeve, t. 48. /. 6.—C. I. 

 f. 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. ^V'^V — 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. ^J-.1tV — ^ m Columbia. 



A. Formosum. Sow. Z. P. 1832.— Reeve, t. 41./. 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. t 7 q..2. — W. Columbia. 



A. Pallidum. Sow. Z. P. 1832 .—Reeve, t. 47./. 3.— C. I. 

 f. 3. Oval, pale purplish, fulvous, darker at the umbones, a thin 

 rather irridescent epidermis, with delicate concentric striae : ante- 

 riorly truncated, dorsal margin rounded. -f s . . 1^. — W. Columbia. 



A. Roseum. Sow. Z. P. 1832.— Reeve, t. 47. / l.— C. I. 

 f. 1. Sub-orbicular, under a brown glossy epidermis, rosy, con- 

 centrically ribbed, anteriorly sub-emarginated, the ribs crowded and 

 acute. 1 T V • • 2-J-. 



A. Lenticulare. Sow. Z. P. 1832. — C. I. f. 9. White, 

 lenticular, smooth, with delicate radiating striae, which centrally and 

 posteriorly are decussated by other sub-concentric and flexuous 

 ones ; anterior margin sub-nexuous ; epidermis very thin and 

 yellowish. 4^.. t 9 q. — W. Columbia. 



A. Rubrolineatum. Co/ir. Jour. A.N.S. Phil. 7 '. p. 239. 

 t. 18./. 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. Phil. 7. p. 239. t. 19./ 2. 



