VALVATA. 53 



Found at Fresh Pond and other ponds, on stones and submerged sticks ; 

 and has been for many years in our cabinets marked as a Paludina. 



Animal very active ; head proboscidiform, half as long as the tentacles, 

 bilobed in front, dark, terminated with light ; tentacles rather stout, light 

 drab-colored, with a line of silvery dots on the upper side, over the large, 

 black eyes ; foot, tongue-shaped, as long as the first whirl, dilated into two 

 acute angles in front, light drab-color ; respiratory organ occasionally pro- 

 truded to half the length of a tentacle on the right side. 



This species is widely distinguished from all other described ones by its 

 minuteness, its color, its elongated form, and its want of an umbilicus ; of 

 which characters the last two seem to arise from the loose manner in which 

 the whorls are united. (Gould.) 



Valvata pupoidea, Gould, Am. Journ. Sc. o. s. XXXVIII, p. 19, 1840 ; 

 Invert, of Mass. p. 226, f. 155. — Haldeman, Mon. p. 10, pi. i, fig. 11- 

 13.— DeKay, N. Y. Moll. 119.— Chenu, Man. de Conch. II, 311, fig. 

 2230. 



Fig. 90 is an enlarged view of one of Dr. Gould's figures. 

 Found also in Connecticut. 



Valvata liuineralis, Say — Shell subglobose, depressed ; spire eon- 

 vex, not prominent; whirls three and a half, with the shoulder depressed, 

 plane ; wrinkled across, or rather with slightly raised lines ; aperture ap- 

 pressed to the penultimate whirl, but not interrupted by it ; umbilicus 

 rather large. Greatest breadth, less than one-fifth of an inch. 



Inhabits Mexico. 



Differs from V. sincera, nob. of the Northwest Territory, in being more 

 depressed, and in having a shoulder or plain surface near the suture. The 

 umbilicus is larger than that of the V. pisclnalis, Mull., and the spire more 

 depressed ; that species is also destitute of the depressed shoulder. 



Valvata hiimeralis, Say ; New Harm. Diss. II, 244 ; Descr. 22. Binney's 

 ed. p. 148. — Haldeman, Mon. p. 9. 



Spurious Species. 



Valvata arenifera, Lea, Tr. Am. Phil. Soc. IV, 104, pi. xv, f. 36 ; Obs. p. 



114. On p. 37 of Vol. V it is said to be the larva case of Phrygania. 

 Valvata cinerea, Say, from Western States, is mentioned by name only 



by Wheatley in his Cat. of Shells of U. S., p. 29; also— 

 Valvata buccata, Lea, Schuylkill. 



