LIMNZA, 101 
with a strong columellar nearly or quite cover- 
ing the umbilicus. Light horn-color, thin. 
Length 19, diam. 9 mill. 
Greenland. 
The volutions are a little more oblique and 
the shell is smaller, but otherwise it does not 
essentially differ from L. palustris. 
17. LIMNA#A HOLBOLLII, Meller. 
Plate 17, fig. 11. 
Shell thin, conic-ovate, spire elongated, 
whorls five, well rounded, with deeply im- 
pressed sutures; aperture small, rounded 
ovate, columella slightly folded; umbilicate. 
Length 12, diam. 6 mill. 
Greenland. 
This shell is at once distinguished from the 
preceding species by its smaller size, rounded 
whorls and aperture, and open umbilicus. It 
is allied to L. humilis, Say, but the spire is 
more elevated and the whorls not so convex ; 
it is also a more solid species. 
: (75) 
