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 ani- 
mal, 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) 
