ooe TESTACEOUS MOLLUSGA. 
the anterior margin; beaks entire, approximate, incumbent; ligament 
very big, much projecting; inside bluish white, stamed with purple 
near the ventral margin and at the front extremity; primary teeth 
very large; lateral teeth crenated or denticulated above, the front one 
very approximate. 4...4}$. Philippines. A few narrow divergent 
folds appear upon the anterior slope. Allied to Keraudreni. 
CYRENA OBESA (t. 15, f. 3), Hinds, Ann. Nat. (1842), 10, p. 81; 
Sulp. p. 66, t. 21, f. 6—Barissa o. Desh. Vener. p. 238. ‘Trans- 
versely obovate, broad and bluntly subbiangulated in front, much 
narrowed and rounded behind, subinequilateral, solid, more or less 
ventricose (chiefly in front), coloured with an olivaceous - yellow 
shining cuticle, marked behind with distant pliciform wrinkles, and 
on the anterior slope with divergent irregular corrugations ; ligamental 
- edge straightish, little sloping; hinder dorsal margin produced, 
decidedly sloping; ventral edge arcuated; ligament very large and 
prominent; no defined lunule, the edges pouting at its ordinary site ; 
umbones not projecting, eroded; inside whitish, stained with purple ; 
lateral teeth crenulated, the hinder one the nearer. 2...24. Heejee 
Isles. 
CyrENnA PLACENS (t. 14, f. 52), Hanl. 7. P. 1844, p. 160.—Desh. 
Vener. p. 252. Suborbicular, subventricose, inequilateral, glossy, with 
close and regular concentric groove-like striz; epidermis yellowish 
green; ventral edge convex; dorsal edge sloping and a little convex 
on either side; beaks eroded; ligament narrow, tawny, depressed ; no 
lunule; inside purple; lateral teeth very minutely wrinkled, but not 
crenated, the hinder one short and approximate. 14...13. Hon- 
duras. 
CyrEeNA sorDIDA (t. 14, f. 51), Hanl. Z. P. 1844, p. 159.—Desh. 
Vener. p. 255.  Suborbicular, thick, subinequilateral, ventricose or 
tumid ; epidermis brownish olive, changing to greenish yellow towards 
the convex ventral margin, concentrically rugulose ; front dorsal edge 
a little convex, sloping; beaks eroded, tolerably prominent; ligament 
somewhat sunken; no lunule; imside whitish throughout; lateral 
teeth short, blunt; the hinder one the more approximate. 14...13. 
Florida? Between C. Carolinensis and C. radiata. 
CYRENOIDA, Joannis. 
Orbicular, equivalve, ventricose, thin, in the typical species with an 
epidermis, smooth or nearly so; ligament external, prominent; car- 
dinal teeth, 3 in one valve, 2 in the other; scars long, narrow ; 
pallial line simple. 
CyrenoipA Dupontta (t. 15, f. 4), Joannis, Mag. Z. 1835, t. 64. 
—Sow. Conch. Man. f.118.—Cyrunoipes Dupontu, Woodw. p, 298, 
