142 MOLLUSCA. 
Found at Nisqually, Oregon. 
Very much like M. scitula, but considerably smaller, more cylin- 
drical, the whorls more plaited, and with a band on the basal one. 
It resembles M. prozima, Say, which is less cylindrical and without 
folds. 
Figures 164, 164 a, two views of the shell. 
MELANIA BULBOSA (Gould). 
Testa parva, conico-oblonga, nitida, decollata, fusco-viridis: spira an- 
fractibus superstitibus duobus ad tribus rotundis ; suturad profunda : 
apertura ovato-rotundata, vix effusa. 
Melania bulbosa, Gouup; Proceed. Boston Soc. Nat. Hist., 11. 225. 
July 1847. Expedition Shells, 46. 
A small, smooth and shining, rather solid, oblong-ovate shell, of a 
dusky green colour, with remarkably rounded, full whorls, separated 
by a deep suture; only two or three whorls remain. ‘The aperture is 
not quite half the remaining length of the shell, broadly ovate, its wall 
scarcely depressed in front, and its posterior angle rounded by the 
very curved contour of the whorl; interior dull bluish-white. 
Length half an inch; breadth nearly as great. 
Inhabits Columbia River, Oregon. Drayton. 
The whorls are very cylindrical, with a deep suture, so as to appear 
like a succession of bulbs. It is much like MW. perfusca, Anthony ; but 
in that the whorls slope gently to the suture. A large but broken 
specimen shows that it often attains a considerable size. 
Figures 163, 163 a, two views of the shell. 
MELANIA PERPINGUIS (Hinps), Ann. Nat. Hist., xv. 9. Voyage of 
the Sulphur, 56, pl. 15, f. 2. 
