234 TESTACEOUS MOLLUSCA. 
mination of the cited specimen in the J. des 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. Atsicosta Lam. 3.—Del. t. 13. f. 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?.—. Indies, Ti- 
mor, Australia. General shape of the last species. The anterior 
dorsal angle prominent but rounded, the posterior extremity rather 
sharply projecting. 
M. Apriatica. Lam. 5. Ovate, thin, obliquely banded, ven- 
tral margin straight, hinge margin somewhat winged, very delicately 
striated concentrically: within bluish. 13.—Adriatic, near Venice 
“Not unlike Tulipa.” 
M. Brasitiensis.—Myrtizivus Moptotvus B. Ch. f. 2020, 1.—M. 
Guyanensis Lam. 4.—Del. t. 13. f. 9.—M. Semirusca. Sow. G. 
—Reeve Syst. t. 101. f. 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. 23.—Guiana. 
M. Semirusca. Lam. 11. Oblong ovate, becoming broader at 
the larger end, with very fine transverse serrated striz, epidermis 
fuscous brown anteriorly, tawny posteriorly ; beaks decorticated : 
marginentire. 13.—Mauritius.? 
M. Securts. Lam. 12.—Mytitus 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. 13.—The larger 
ones from New Holland the smaller from Timor. Allied to if dis- 
tinct from M. Incurvata. Leach. Z. M. t. 72. f. 3. 
M. Micrortera. 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. 4. 19. f 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 irridescent. 
2.—U. California. 
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