Description of New Species of Pisidium. 65 



IX. Descriptions of Three New Species o/PisiDlUM. 

 By TEMPLE PRIME. Read September 6, 1853. 



i. Pisidium cicer. 



CABINET OF THE DESCRIBEE, 



Plate I Fig. 1, a, b, e. 



Shell medium sized, much inflated, rather short, thick and 

 heavy ; beaks not large but prominent ; posterior margin some- 

 what abrupt. Striae light. Epidermis glossy. Anterior mar- 

 gin abrupt from the beaks downwards. Color brownish green. 

 Interior blue. Length 0.25, Breadth 0.23, Diam. 0.12 inches. 



Habitat. Washington County, K Y. (Ingalls.) 



Remarks. A rare shell ; more inflated and heavier than either 

 P. compressum or P. altile. 



2. Pisidium contort urn. 



[CABINET OF THE NEW YORK LYCEUM OF NATURAL HISTORY. 

 Plate I. Fig. 2, <z, 6, c. 



Shell small, elongated ; beaks large and prominent ; anterior 

 margin very abrupt, posterior one less so ; slight ridges from the 

 beak towards the inferior part of the anterior margin. Sulca- 

 tions slight. Length 0.13, Breadth 0.07, Diam. 0.5 inches. 



Habitat. Found subfossil at Pittsfield, Mass., in company 

 with P. ventricosum. (Shurtleff.) 



Remarks. This is a singular species, unlike any other of this 



