PLATE CI. 



Tiver Froome, where It is known the Mya ovata is also found ; and as 

 to colour, it is no criterion : both kinds are greenish, radiated witli 

 yellow, and are more or less vivid in different shells : they are seldom 

 higher in colour than the specimen we have figured ; some are more 

 od"An olive colour, and others are deeply tinged with brown. 



