352 TESTACEOUS MOLLUSCA. 



the anterior margin ; beaks entire, approximate, incumbent ; ligament 

 very big, much projecting ; inside bluish white, stained 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...4f. Philippines. A few narrow divergent 

 folds appear upon the anterior slope. Allied to Keraudreni. 



Cyeena obesa (t. 15, f. 3), Hinds, Ann. Nat. (1842), 10, p . 81 ; 

 Snip. p. 66, t. 21,/. 6. — Batissa 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...2|. Feejee 

 Isles. 



Cyrena placens (t. 14, f. 52), Hani Z. P. 1844, p. lQO.—Desh. 

 Vener. p. 252. Suborbicular, sub ventricose, inequilateral, glossy, with 

 close and regular concentric groove-like striae ; 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. l|...lf, Hon- 

 duras. 



Cyrena sordida (t. 14, f. 51), Hani. 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 ; inside whitish throughout ; lateral 

 teeth short, blunt ; the hinder one the more approximate. li...lj-. 

 Florida f Between C. Carolinensis and C. radiata. 



CYRENOIDA, Joannis. 



Orbicular, equi valve, 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. 



Cyrenoida Dupontia (t. 15, f. 4), Joannis, Mag. Z. 1835, t. 64. 

 — Sow, Conch. Man.f. 118. — Cyrenotdes Dupontii, Woodw. p. 298, 



