100 
HELICID^. 
Animal grey^ shining; foot thin; tentacles long. 
Shell the tenth of an inch in diameter, glossy, 
dark korn-coloured, with six rounded volutions, 
which are much raised and strongly defined; the 
base prominent, with a depression in the centre 
forming an incipient umbilicus ; aperture transverse, 
narrow, as high as broad ; with a very thin margin 
reflected only near the depression, which in young 
shells is hardly visible. Varies in the intensity of 
the colour and in transparency, the specimens found 
in very damp situations being generally much darker 
and more polished ; epiphragm transparent. 
Mr. Alder observes that the small variety is not 
uncommon ; it is darker coloured, and with very 
delicate and beautiful concentric stride on the base 
only visible with a high magnifier, which induced 
him at first to consider it distinct ; but on closer ex- 
amination he found slight traces of these stride visi- 
ble on the full-grown and decided specimens of H. 
fulva ; he has therefore not ventured to separate it. 
(1. c. 108.) 
4. Helix. (Snail.) 
The animal moderate, with an elongate depressed 
foot, and a large, produced, central, spiral body 
covered with a subglobose or depressed shell, 
with a lunate mouth, which is generally broader 
than long, strengthened with an internal thick- 
ened rib, and more or less reflexed edges ; ten- 
tacles four, the two lower small, club-shaped. 
Tongue broad, with many (100 to 200) longi- 
tudinal series of flat square teeth, with rounded 
tips. 
