CYRENA. 



" Species forma inflata, testa teiiui, apicibus promineutibus nb 

 affinibus valde recedit, et Isocardiam cor in mentem vocat. " 

 I have not been able to identify this species. 



ST. Cyrena lloliTiaiia, Philippi. — C. testa subtrigona, valde in- 

 jequilatera, regulariter trausversim uudato sulcata, epidermitle olivacea 

 vestita, extremitate antica rotundata, postica acute angulata rostrata ; 

 margine dorsali postico longissimo, parum arcuato; medio lunulse tuiuido; 

 apicibus iiitegris ; dentibus lateralibus abbreviatis integris ; cardinalihus 

 integris ; pagina interna violaceo-sufFusa ; sinu palliari distiucto angusto. 

 Long. 16'"; Alt. 14'"; Crass. 8'". 

 Hah. South America, in Bolivia. (Cabinet of Largilliert.) 

 Cyrena bolivlana, Philippi, Zeit. Malak. 1851, 70. 



I have not been able to identify this species. 



b. Anomalous Species. 



28. Cyrena maritima, C. B. Adams. — Shell orbicular-heart- 

 shaped, inequilateral, solid ; anterior side 

 sliort, rounded ; posterior side produced, trun- F'?- -C. 



cated at extremity ; beaks large, inclined an- 

 teriorly, approximate at apex, acute, not 

 eroded ; valves very full, whitish inside ; 

 striae coarse, irregular; epidermis greenish- 

 brown, worn on the upper portion of the 

 shell ; hinge-margin narrow, not much curv- 

 ed; cardinal teeth small, narrow, subequal, 

 divergent, bifid ; lateral teeth depressed, at 

 about the same distance from the cardinal 

 teeth, a small narrow indentation leads from 

 the anterior tooth to the cardinal teeth ; sinus 

 not distinguishable. 



Long. 2.26; Lat. 1.94; Diam. 1.44 inches. 

 " 56 : " 48 ; " 36 mill. 



Hah. Central America, at Panama. (Cabinets of Amherst College. 

 Cuming and Prime.) 



Cyrena maritima, C. B. Adams, Ann. N. Y. Lye. V, 1852, 499. 



The late Professor Adams, from whom I obtained my specimen 

 of this species, says of it, " its station is in impalpable mud under 

 bushes at high-water mark where a small stream emptied ; some 

 of the dead shells have balani growing upon them ; nine specimens 

 were collected at two-and-a-half miles east of Panama." 



C. maritima. 



