SO TESTACEOUS MOLLFSCA. 



230. 1— E. t. 262./. 6. (Worn shell. T. Pctrpurascens. Gmel. 

 323. — W. t. 4. f. 49.) Triangular, wedge-shaped, anteriorly 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. 14-. . 1 ^. — Sumatra. 



D Deltoides. Lam. 5. — An. Sow. G. ? — Reeve, t. 60./*. 4. ? 

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

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

 pressed than the last. 



D. Faba. Chem.f. 267.— D. p. 155.— W. t. 6. f. 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. — Ch.f. 266. f .. — Malabar. 



D. Abbreviata. Lam. 7. Triangular, proportionally 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. Lam. 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 strife. — Variety. With the 

 zones and interior violet. — Variety. White. j-«.l. — New 

 Holland. 



D. Veneriformis* Lam. 10. Roundish, triangular, trans- 

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

 nulated striae. 1 T V« — Asiatic Ocean. 



D. Austsalis. Lam. \\.-Ast. t. 81. ./I 20, 1, 2.— D. Ob- 

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

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

 sated and sub-granular, li. — New 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. -^New Holland. — Not unlike Capsa 

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

 shaped. 1 



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

 the shell figured as Deltoides by Sowerby (Sow. G. f. 4.) and 

 Reeve (t. 60./*. 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- 



