234 



TESTACEOUS MOLLUSCA. 



ruination of the cited specimen in the J. dcs Plantes. It by no means 

 agrees \ with the expression of his text " angustior " It closely resembles 

 if it be not identical with the M. Radiata of Brown. 



M. Albicosta Lam. 3. — Del. t. 13./. 8. Ventral edge obso- 

 letely sinuated ; bluish ash colour under a rufous or fawn coloured 

 epidermis, a white radiating band on the posterior side of the umbo- 

 nal ridge which becomes indistinct anteriorly. I J. — E. Indies, Ti- 

 mor, Australia. General shape of the last species. The anterior 

 dorsal angle prominent but rounded, the posterior extremity rather 

 sharply projecting. 



M. Adriatica. Lam. 5. Ovate, thin, obliquely banded, ven- 

 tral margin straight, hinge margin somewhat winged, very delicately 

 striated concentrically: within bluish. Ij. — Adriatic, near Venice 

 "Not unlike Tulipa." 



M. Brasiliensis.— Mytilus Modiolus B. Ch.f 2020, 1.— M. 

 Guyanensis Lam. 4. — Del. t. 13. f 9. — M. Semifusca. Sow. G. 

 — Reeve Syst. t. 101./. 6. Oblong-subcuneiform, the umbonal 

 ridge almost obsolete, ligamental edge scarcely elevated, very long ; 

 anterior edge convex ; ventral, nearly straight, scarcely incurved ; 

 beaks touching : nacre pearly white, becoming purplish at the an- 

 terior extremity ; exterior green anteriorly, rufous posteriorly, the 

 colours separated by a very oblique narrow tawny ray ; very distinct 

 and regular concentric wrinkles ; posterior extremity extremely 

 narrow and prominent. 1\. — Guiana. 



M. Semifusca. Lam. 11. Oblong ovate, becoming broader at 

 the larger end, with very fine transverse serrated striae, epidermis 

 fuscous brown anteriorly, tawny posteriorly ; beaks decorticated : 

 margin entire. 1J-. — Mauritius.? 



M. Securis. Lam. 12. — Mytilus S. Desh. E. vol. 2. p. 567. 

 Oblong, little incurved, acutely keeled at the dorsal edge, merely 

 striated transversely, dark purple with the epidermis blackish brown: 

 within violet, the inner margin quite entire. 1^. — The larger 

 ones from New Holland the smaller from Timor. Allied to if dis- 

 tinct from M. Tncurvata. Leach. Z. M. t. 72. f. 3. 



M. Microptera. Desh. in Lam. vol. 7. p. 27. — Ch.f. 760. 

 Narrow elongated, smooth under a yellowish brown scaly epider- 

 mis, and white slightly tinged with red or violet ; beaks small and 

 rounded ; the hinge margin forming a small compressed and angu- 

 lar wing. 2. — Coromandel. . In shape not unlike M. Sulcata. 



M. Recta. Conr. Jour. A.N.S. Phil. 7. p. 243. t. 19./ 1. 

 Transversely elongated, narrow, anteriorly produced and lingui- 

 form, the ligamental edge elevated but not angulated at its extre- 

 mity ; the ventral edge straightish ; brown with a broad pale oblique 

 stripe from the beaks anteriorly ; inside very glossy and irridesccnt. 

 2. — U. California. 



