80 TESTACEOUS MOLLUSCA. 



230.1— E. t. 2G2./. G. (Worn shell. T. Purpurascens. Gniel. 

 323. — W. t. 4.f. 49.) Triangular, wedge-shaped, anterioi'ly de- 

 pressed, and somewhat wrinkled transversely ; most minutely 

 striated longitudinally, tawny flesh colour with dull lilac zones : 

 angle at the beaks sharp ; margins angulated : anterior slope 

 totally destitute of longitudinal striae, l^^ . . 1 i • — Sumatra. 



D Deltoides. Lam. 5. — An. Som. G. ? — Reeve, t. 60. f. 4. ? 

 Triangular, pink, and nearly smooth, the anterior slope flattish and 

 longitudinally striated. Kangaroo Island. — Larger and less com- 

 jiressed than the last, 



D. Faba. Cheni. f. 267.-1). p. 155.— TF. ^.6./. 16.— D. 

 Radians. Lam. 6. — E. t. 261. f. 7. Oval, convex, finely 

 striated transversely, the anterior slope obliquely wrinkled, white 

 rayed with fulvous but variable in colour. — Variety. Not rayed 

 but spotted.— 6Vi./. 266. ^..—Malabar. 



D. Abbreviata. Lam. 7. Triangular, proportionably less 

 broad than the other species, very delicately striated transversely, 

 polished white with two red and a bluish ray, anterior slope with 

 ragged wrinkles ; ventral margin quite entire and arcuated. 1|^. 



D. CoLUMBELLA. Lavi. 9. — Del. t. 6.f. 1. Ovate, cuneiform, 

 polished with radiating anastomosing lines, very pale violet with 

 indistinct zones : anterior side short and obliquely truncated, the 

 slope with crowded and transverse strise. — Variety. With the 

 zones and interior violet. — Variety. White. f'.l- — New 

 Holland. 



D. Veneriformis. I^am. 10. Roundish, triangular, trans- 

 versely striated, grey with indistinct rays : anterior slope with cre- 

 nulated striae. l-jV- — Asiatic Ocean. 



D. AusTRALis." Lam. U.—Ast. t. 81./. 20, 1, 2.— D. Ob- 

 scura. Desk. E. t. 2. p. 98. Ovate-triangular, transversely 

 striated, whitish or fulvous : violet within ; anterior slope decus- 

 sated and sub-granular. l^.— Neiv Holland and Timor.— Not 

 unlike Bicolor. 



D. Epidermia. Lam. 12. Triangular, wedge-shaped, nearly 

 smooth ; anterior end obtuse, and the slope longitudinally striated : 

 epidermis yellowish green. —iVe?2J Holland. — Not unlike Capsa 

 Levigata, but differing by its hinge, and the being more wedge- 

 shaped.^ 



1 I have not seen an authenticated specimen of this species, but 

 the shell figured as Deltoides by Sowcrby (Sow. G. f. A.) and 

 Reeve {t. 60. f. 4.) agrees better with this brief description, than 

 with the equally concise characteristics of that species. The follow- 

 ing description is taken from a specimen named by Mr. Sowerby 

 himself. Triangular, sub-cuneiform, glossy, orange yellow under a 

 very thin olive epidermis, posteriorly attenuated obtuse, much com- 



