VALVATA. 43 



Proposed by Prof. Theo. Gill as a distinct 

 genus, but until we obtain further information 

 relative to the anatomy and habits of the aui- 

 malj I think it better to retain it as a subge- 

 nus of Valvata. 



5. VALVATA PUPOIDEA, Gould. 

 Hald., p. 10, t. 1, figs. 11—13. 



This species has not been detected elsewhere 

 than in the vicinity of Boston, Mass. 



(16) 



