288 PALUDINIDiE. 



Valvata pupoidea.* 



Fig. 155. 



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

 disjoined. 



Valvata pupoidea, Gould, Am. Journ. Sc. 1st ser. xxxviii. 196, 1840; Inv. Mass. 226, 

 fig-. 155; Otia, 180. — Haldemax, Mon. 10, pi. 1, fips. 11 - 13. — De Kay, N. Y. 

 Moll. 119. — Chexu, Man. de Conch, ii. 311, «<?• 2230. — Anonymous, Can. Nat. 

 ii. 214, fig. — W. G. BiNNEY, L. and Fr. Shells, iii. 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 

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

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

 V. pupoi- 0116 half of the cylinder ; the last entirely disjoined from the 

 Enilrged pi"Gceding one 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 

 Pahidina. 



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 (Linsley) ; District of Columbia {Gi- 

 rard) ; Maine {Mig-hels') ; and Canada (^Can. Nat.}. 



* This species is made tlic tvpe of a new genus, Ljjo(ji/riis, by Professor Gill (Proc. Ac. 

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

 lieving it distinct. — W. G. B. 



