Mr. J. W. Williams on a new Speciefi o/'AinpulIaria, 47 



duced on a much lower plane, as shown in a side view of the 

 pvosternum (tig. 2) . 



The prosternal stria3 join in front and the keel at the coxa3 

 begins to widen out gradually to its base. The apices of the 

 anterior femora (shown in fig. 1) are grooved in a remarkable 

 manner and are built up with semicircular edges, and the 

 grooves are very finely but very distinctly transversely 

 striate. 



Ilab. San Estaban ; taken in March 1888. 



Idol i a Integra^ n. sp. 



Orbicularis, perconvexa, picea, nitida, pedibus anteuuisque rufis ; 

 fronte subtilissime efc minutissime strigosa, margiue elevato, aiitice 

 haud iuterrupto ; pronoto, stria margiuali iiitegra, elevata, late- 

 raliter distiucte sinuato ; prosterno miuutissime strigoso, lateralitor 

 striate ; mesosterno stria antice integra metasteraoque disperse 

 pxinctulatis ; pygidio la3vi. 



Long. 2 mill. 



lioh. San Estaban. 



This species is exceedingly like Idolia gihha, Lewis, but 

 the mesosternal stria is conqdcte in front and the two sternal 

 plates are distinctly punctulate. In Idolia gihha the meso- 

 sternal stria terminates on each side at a point opposite the 

 prosternal stria, and is therefore widely interrupted, and it is 

 at present the only described species in which it is so. 



V. — Note on a new Species of Kn\\)\\\VA\m from the 

 La Plata. By Joseph W. Williams. 



Me. W. D. Geokge, of Charlton, has recently sent me an 

 Ampullarian which he collected in October 1888 from some 

 marshes near the La Plata, at Buenos Ayres, in the Argen- 

 tine Republic. I have, in company with Mr. Edgar Smith, 

 examined the species belonging to this genus which are in 

 the National Collection, and not found one to which this 

 present shell could be referred ; I have also looked over 

 the various literature known to me on the genus, and have 

 found no description which could be applied to this form. I 

 therefore name it (provisionally at any rate) Ampullaria cana- 

 liculata, for a reason which will be readily noticed in the 

 following description. 



The shell is large, solid, and thick. Its length is 6 centim. 



