36 



SYNOPSIS OF 



in 



;^ 



O 



o 

 >^ 



CO 



;^; 

 o 



WIDK. 



o --• 



o 



Mya ovalis. Monta. 



Mya ovata. 2)ow. il/a/f. ^Food Z)«7/. 



Mya ovalis.* Sow. 



Mya depressa. Don. 



Mysca solida. Turt. 



Unio nodulosa. Lam. 



Unio tumida. ^e^^. Pfeif. Nil. 



Unio Michaudiana? Z)e* Maul. 



Unio ovata. Bouil. 



Unio rostrata. Stud. 



Unio Limagnae. Bouil. 



pictorum. Lam. Pfeif. Drop. Blain. Crouch. 



Flem. Des Moul. Grat. Boiiil. 

 Mya pictorum. Lin. Poll. Dill. JFood. 



Mat. 

 Mya corrugata Maroccana.t Chem. 

 Mya augustata. Schrcet. Klein. 

 Mysca pictorum. Turt. 

 Unio rostrata. Lam. Pfeif. Mich. Desh. 



Bouil. 

 Unio manca. Lam. 

 Unio elongatula. Mi'ihl. 



* On the authority of Fevussac. 



-j- Chemnitz figures this shell table 3, fig. 23 & 24. From the description 

 and outline I have little doubt of its being a young pictorum, more than 

 usually undulated in the region of the beaks. Its being rugose over the whole 

 surface, as mentioned by him, is not evidence against its being such. As the 

 first growth subsequently forms the beak of the shell, it ought of course to be 

 rugose, if that be the character of the shell. The inside view is without 

 teeth, but this is doubtless the fault of the draftsman or engraver, as the au- 

 thor speaks of the hinge being like the common mussel. 



