PLATE CX. 



tooth in each valve ; on the contrary Solen Siliqua has two teerh in 

 one valve, and one in the other; the single one being inserted be- 

 tween the two others when the shell is shut. 



This is very scarce. Pennant says it inhabits Red Wharf, Anglesea, 

 —This is not Solen Vagina of Linnaeus, as Pennant describes it. 



