110 LAND AND FRESH-WATER MOLLUSKS. 
that preceding it; umbilicus moderately large; 
aperture oblique, crescent-shaped, broader than 
high ; diameter from one-twelfth to one-sixth of 
an inch. ; 
HELICELLA NITIDA—(the Glossy Snail) (Pl. VIL., 
fig. 54).—The shell is flattened, with the spire 
somewhat raised, more so than in H. nitidula, of 
a greyish-brown colour, glossy and semi-trans- 
parent, rather strongly transversely wrinkled; 
there is no whiteness or opacity beneath ; whorls 
five; the umbilicus large and deep; aperture 
oblique, roundish, longer than-broad ; diameter 
three-twelfths of an inch; height nearly half 
the breadth. 
The animal is bluish-black, and the shell when 
it contains the body appears of a dark chocolate- 
brown. ‘This species differs from H. nitidula in 
its greater convexity, stronger striations, wider 
umbilicus, and in being destitute of an opacity 
underneath. 
It is not a common species, inhabiting moist 
places among herbage, on the margins of muddy 
streams, ditches, and marshy places. 
HeLicenta FuLVA—(the Fulvous Snail) (PL. 
VIL., fig. 56).—This species is easily recognized 
by its conical shell with a shallow ill-defined 
umbilicus. The shell is thin, glossy, semi- ~ 
transparent, and horn-coloured, as in the other 
Helicelle. 
