86 



JS T otes on Species of Co?'hiculadce. 



The shell is oval-suborbicular, nearly equilateral, and some- 

 what inflated. The anterior side is rounded, the posterior is 

 subobtuse. The beaks are small, they curve inwardly and are 

 approximate. The valves are solid. The interior is white. 

 The hinge is broad. The cardinal teeth are narrow and diver- 

 gent, the two principal ones are bifid. The anterior lateral 

 tooth is conical and the posterior one somewhat elongated and 

 flattened. The strias are more or less obsolete. The epidermis 

 is light green and polished. The ligament is narrow, elongated, 

 and not prominent. 



This species is less inflated and less orbicular than Cyrena 

 sphcerica, and it is more inflated and less produced than either 

 Cyrena nitida, Papuana, or Bernardiiana. 



3. Cyrena Siaawica, Prime. 



Cyrena Siamica, Prime. Acad. K S. Phil. Proc. 126. 1861. 

 Prime Cat. 6. 1863. 



C. testa ovato-transversa, subtrigona, inequilateral], subinflata ; postice 



Fig. 35. 



Cyrena Siamica. 



subtruncata, antice valde declivi, in medio convexa'; epidermidc fusca 



