426 



MOLLUSCA : ACEPHALA. 



FIG. C35. 



Solen ensis, Liun. Much Iteducud. Atlautic. 



. 



FIG. 636. 



Mya arenaria, L. Reduced. 

 Northern States. 



FIG. 638. , 



Cytkerea dione, L. Reduced. 

 West Indies. 



FIG. 640. 



Tellina donacina. Britain. 



FIG. 637. 



Pandora obtusa, Britain. 



FIG. 639. 



Mactra elliptica. Britain. 



FIG. 641. 



Tellina tenera, Say. 

 Our coast. 



Tellina tenta, Say. 

 Our coast. 



tuns, muscle), or those whose shell is closed with two 

 muscles, as in the Clam (Mya\ etc., and, 2. MONOMYARIA 



