CYRENA. 2t 



&quot; Species forma inflata, testa tenui, apicibus prominentibus ab 

 affinibus valde recedit, et Isocardiam cor in mentem vocat.&quot; 

 I have not been able to identify this species. 



2. Cyrena l&amp;gt;oliviaiaa, PHILIPPI. C. testa subtrigona, valde in- 

 sequilatera, regulariter transversim undato sulcata, epidermide olivacea 

 vestita, extreraitate antica rotundata, postica acute angulata rostrata ; 

 tnargine dorsali postico longissimo, parum arcuato ; medio lunulse tumido; 

 apicibus integris ; dentibus lateralibus abbreviatis integris ; cardinalibus 

 integris ; pagina interna violaceo-suffusa ; sinu palliari distincto angusto. 



Long. ] 6&quot; ; Alt. 14 &quot; ; Crass. 8 &quot;. 



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

 Cyrena boliviana, 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 

 short, rounded ; posterior side produced, trun- Fig. 20. 



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 ; &quot; 48 ; &quot; 36 mill. 



Hab. 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, &quot; 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. 



