294 paludinidj:. 



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 silvery, with a dark line running along 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 bi- 

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



Under this species I include many small shells, hitherto regarded 

 as Pa/iidino', 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 CyrJos- 

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

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

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

 lustrica. Say, is described as much smaller, much more elongated, 

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

 Valvata pupoidea in an immature state. It approaches nearest to 

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

 elongated. 



From Hudson's Bay and Wisconsin to Virginia ; Nova Scotia 

 {Willis). 



Amnicola granum. 



Paliidina rjrann, Say, Jouin. A. N. Sc. ii. 'MS (1822) ; Binney's ed. 110. 

 Amnlco/d <;nii>iim, Haldkman, Mon. 17 (1844?). — De 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 orbicular, hardly angulated above ; 

 labium with the superior edge appressed to the surface of 

 Fig^56o. ^1^^ penultimate volution ; umbilicus rather small, profound. 

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

 A. acrn- Inhabits Pennsylvania. 

 3 This very small species is found in ])lcnty in the fish-ponds 



at Harrowgate, crawling on the dead leaves which liave 

 fallen to the bottom of the water. It resemliles P. histrica, but is 

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



