GASTEROPODA. 123 
Two or three imperfect specimens, apparently of this species, were 
brought from the Columbia and Sacramento Rivers. They are very 
thin and ventricose, and the aperture is at least half the leneth of 
the shell. Similar individuals may be found among New York 
specimens. It may be remarked, that all the land and fresh-water 
shells beyond the Rocky Mountains have a very fragile structure. 
Dompeya FasciaTa (Gould). 
Testa ovata, tenuis, ferrugineo-virens, fusco spiraliter fasciata, creber- 
rumé plicato-striata et lineis volventibus minimis decussata: spira 
acuta; anfractibus sex ventricosis ; suturd palhda, marginata ; aper- 
tura semilunaris ; columella alba, plica acuta instructa. 
Dombeya fasciata, Gouin ; Proceed. Boston Soc. Nat. Hist., it. 211. 
June 1847. Expedition Shells, 41. 
SHELL ovate, thin, shining, of a rusty greenish colour, with four or 
five narrow bands of dusky, and occasionally some undulating longi- 
tudinal ones. Surface finely plaited by the lines of growth, which are 
crossed by very minute revolving lines. Whorls six, very ventricose, 
forming an acute, entire apex. The suture is nearly white, and has a 
marginal impressed line. Aperture two-thirds the length of the shell, 
semilunar, being nearly as acute anteriorly as posteriorly. Columella 
white, sharp, with an acute fold above the middle. Interior whitish, 
displaying the brown bands of the exterior. 
Length three-fourths of an inch; diameter three-eighths of an inch. 
Found in the river Concon, Quillota, Chili. Cowthouy. 
Allied to Chilina fluctuosa, D’Orb. (fragils, Gray), but is more 
regular in form, more ventricose, and more solid ; and it is noted for its 
very minute revolving lines, its bands, and its pale suture. 
Figures 145, 145 a, two views of the shell. 
