24 AMERICAN CORBICULADJB. 



Long. 1.81; Lat. 1.56 ; Diam. 1.20 inches. 



&quot; 45; &quot; 39; &quot; 30 mill. 

 Hob. North America, in the State of California. (Cabinet of Cuming.) 



Cyrena subquadrata, DESH. (preoc.) Proc. Zool. XXII, 1854, 21. 

 Cyrena californiensis, PRIME, Proc. Ac. N. S. Phil. 1860, 276. 



The only specimen I have seen of this rare species is the one in 

 the collection of Mr. Cuming. In shape this shell is somewhat 

 like that of the C. radiata, but otherwise they are widely distinct ; 

 it is very different from all other species of the genus. 



20. Cyrena panamensis, PRIME. Shell orbieular-subtrigonal, 

 heart-shaped, ventricose, inequilateral ; anterior side short, concave on the 

 upper part, produced and rounded in front ; posterior side broader, ob 

 liquely truncated, obtuse at extremity ; beaks large, very prominent, oppo 

 site, approximate at apex ; strise light, irregular ; epidermis brownish- 

 green ; hinge-margin very narrow ; cardinal teeth unequal, small, diver 

 gent ; anterior lateral tooth thicker than the posterior. 



Long. 2.20; Lat. 2.08 ; Diam. 1.68 inches. 



&quot; 55; &quot; 52; &quot; 42 mill. 



Hab. Central America, at Panama. (Cabinets of the British Museum 

 and Cuming.) 



Cyrena inflata, DESH AYES, (preoc.) Proc. Zool. XXII, 1854, 23. 

 Cyrena panamensis, PRIME, Proc. Ac. N. S. Phil. 1860, 283. 



A rare shell, the only specimen I have seen is the one from Mr. 

 Cuming s collection. Compared with C. cumingii it is smaller, 

 more tumid, transversely less elongated ; it differs from C. mari- 

 tima in being more tumid, transversely shorter, and in having more 

 prominent beaks. 



21. Cyrena recllizii, PRIME. Shell heart-shaped, inflated, sub- 



equilateral, tumid ; anterior side rounded ; poste- 

 rior side subtruncate ; beaks prominent, inclined 

 anteriorly, approximate at apex ; lunula obsolete ; 

 strise irregular ; epidermis dark brownish-green ; 

 valves solid, full, interior whitish ; hinge-margin 

 curved, broad ; cardinal teeth unequal, divergent, 

 bifid ; anterior lateral tooth narrow, robust, nearer 

 the cardinal teeth ; posterior tooth lamellar, dis 

 tant. 



Long. 2.96; Lat. 2.96; Diam. 2.20 inches. 

 &quot; 74; &quot; 74; &quot; 55 mill. 



C. recluzii. Hab, Central America. (Cabinet of Cuming.) 



