294 PALUDINID^. 



Found in ditches and brooks, clinging to stones and submerged 

 plants, oftentimes in great numbers. 



Animal a light drab color tinted pink, the head a little flesh- 

 colored above ; tentacula silverv, with a dark line runnino- alono- the 

 outside from the eyes, which are at the external base ; foot not 

 reaching beyond the first whorl, broadly rounded behind, dilated 

 into angles at each side in front ; head half the width of the foot, 

 and projecting beyond it, motions very slow. In delicate and clean 

 specimens, a dark mark parallel to the outer lip, and another Iji- 

 sccting it, and belonging to the animal, appear through the shell. 



Under this species I include many small shells, hitherto regarded 

 as Paludincc, which are collected in this region, ascribing the very 

 great differences they present in color and size to differences of 

 locality and age. The shoulder of the whorls, the conspicuous um- 

 bilicus, and the rounded aperture, almost like Valvata or Cydos- 

 toma, are the most obvious characters. It is less solid, less elon- 

 gated, the aperture more circular, and the inner lip much less 

 closely appressed to the preceding whorl than A. limosa, Say. A. 

 Instrica, Say, is described as much smaller, much more elongated, 

 and more cylindrical. This I strongly suspect to be identical with 

 Valvata pnpoidea in an immature state. It approaches nearest to 

 A. Cmcinnaliensis, Anthony, which is larger and more conical and 

 elongated. 



Fi'om Hudson's Bay and Wisconsin to Virginia ; Nova Scotia 

 {Willis). 



Amnicola granum. 



Pnludina rjrana. Say, Jonrn. A. N. Sc. ii. 378 (1822) ; Binney's ed. 110. 

 Amnicola (/ranmn, Hardeman, Mon. 17 (1844?). — Dk Kay, N. Y. Moll. 88 (1843).— 

 W. G. BiNNEY, Land and Fr. W. Shells, iii. 86, fig. 170. 



Shell conic-ovate ; whorls not perceptibly wrinkled, convex ; sut- 

 ure deeply impressed ; aperture orljicular, hardly angulated above ; 

 labium with the superior edge appressed to the surface of 

 Fig^eo. ^1^^ penultimate volution ; umbilicus rather small, profound. 

 ^^ Length, less than one tenth of an inch. 

 A- (c-a- Inhabits Pennsylvania. 



num. m • • • • • 1 /• 1 



3 This very small species is found in plenty in the fish-ponds 



at Harrowgate, crawling on the dead leaves which have 



fallen to the bottom of the water. It resembles P. histrica, l)ut is 



a smaller, less elongated shell, and the superior portion of the la- 



