CYRENA. 



13 



2 Cyretia sordida, HANLEY. C. testa suborbiculari, crassa, sub- 

 inaequilaterali, ventricosa aut tumida ; epidermide olivaceo-fucescente et 

 marginem ventralem convexum versus, luteo-virescente, coucentrice rugu- 

 losa ; margine dorsali postico, convexiusculo, declivi ; natibus erosis, satis 

 prominentibus ; ligamento subinfosso; lunula nulla; superficie interne 

 albida ; dentibus lateralibus brevibus obtusis, antico magis approximate. 

 Long. 1.60; Lat. 1.50 inches. 



Hob. Central America. (Cabinet of Hanley.) 



Cyrena sordida, HANLEY, Proc. Zool. XII, 1844, 159. Index Test. 

 Suppl. pi. xiv, f. 51. 



I have not been able to identify this species. &quot; The link be 

 tween C. caroliniensis and C. radiata, uniting the interior and 

 membranaceous wrinkles of the former to the general outline of 

 the latter.&quot; Hanley. 



3. Cyrena radiata, HANLEY. Shell rounded, somewhat oblique, 

 heart-shaped, thick, solid, inequila 



teral, tumid, anterior side broad, 

 rounded, posterior somewhat more 

 extended, abrupt at extremity ; 

 beaks small, acute, approximate at 

 apex, entire ; strise regular, epider 

 mis light olive-green, shiny; interior 

 of the valves violet ; hinge-margin 

 very much curved, thick ; cardinal 

 teeth unequal, divergent, the poste 

 rior teeth bifid at summit ; lateral 

 teeth unequal, the anterior tooth ap 

 proximate, the posterior tooth elon 

 gated ; sinus broad at mouth, acute 

 at extremity, very short. 



Long. 1.40; Lat. 1.20 

 42; &quot; 39 



Fig. 7. 



C. radiata. 



Diam. 1.00 inch. 

 28 mill. 



Hab. In Central America, at Realejo, Nicaragua. (Cabinets of Hanley, 

 the British Museum, Smithsonian Institution, Sowerby, Jay and Prime.) 



Cyrena radiata, HANLEY, Proc. Zool. XII, 1844, 159. 



The specimens from which this description was prepared were 

 identified for me by the author himself. In some cases the epider 

 mis of this species shows rays of a, darker hue running from the 

 beaks to the basal margin, this feature is, however, rather the ex 

 ception than the rule. Compared with C. arctata, to which it 



