288 - PALUDINID^. 



Valvata pupoidea.* 



Fig. 155. 



Shell minute, elevated, chestnut colored ; whorls four or five, the last nearly 

 disjomed. 



Valmta ]iupoiden, Gould, Am. Joiirn. Sc. 1st ser. xxxviii. 196, 1840; Inv. Mass. 226, 

 fin;. 1.5.5; Otia, 180. — Haldeman, Mon. 10, pi. 1, fifjs. 11 - 13. — Dk Kay, N. Y. 

 Moll. 119. — CiiExu, Man. de Conch, ii. 311, fig. 2230. — Anoxyjiols, Can. Nat. 

 ii. 214, fig.— \V. G. BiNNEY, L. and Fr. Shells, ili. 13, fig. 19 (1865). 



Shell small, elongated-ovate, opaque, chestnut colored, when di- 

 vested of the rough,, dirty pigment which usually adheres closely to 

 it ; whorls four or five, minutely wrinkled, the posterior one 

 ^'°ie^^ small and flattened so as to form an obtuse apex ; the others 

 ^ cylindrical, and so partially in contact as to expose about 

 V. p„poi- one half of the cylinder ; the last entirely disjoined from the 

 Eniared pi'^ccding oiic for at least the half of a revolution ; aperture 

 circular, lip simple and sharp ; on looking at the shell from 

 below, no umbilical opening is found ; operculum horny, apex cen- 

 tral, elements concentric. Length, one tenth of an inch ; breadth, 

 three fortieths of an inch. 



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 ten- 

 tacles, bi-lobed 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 whorl, dilated into two acute angles in front, light drab 

 color ; respiratory organ occasionally protruded 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. 



Found also in Connecticut (Linslcy') ; District of Columbia {Gi- 

 rard) ; ]\Iaine {Mig-hels) ; and Canada (Caw. Nat.^. 



* This species is made the type of a new genns, Li/orji/nts, hy Professor Gill (Proc. Ac. 

 Nat. Sci. Phil. 1863). It does not nppear to me that there are sufficient grounds for be- 

 lieving it distinct. — W. G. B. 



