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species. These for the greater part were uniform in their 
character, for the most part small in size, thin and horn-like 
in the texture of the shell; the sculpture, when present, 
being modifications of fine striae or well defined small riblets 
placed more or less transversely on the whorls. The colour- 
ing of the shells uniformly brown, relieved in some species 
by mottlings of a reddish horn-colour like tortoise-shell-— 
the general tendency in the forms of variation from the 
typical Helix being in the direction of the smooth and 
polished Zonites, and the few whorled and dilated mouthed 
shells of Vitrina. 
Helix Launcestonensis is however a marked exception to 
the general type of Tasmanian shell, as it also is their largest 
species, about lin. in diameter, strong and solid, with 
wrinkled surface and granular edges on the top part of the 
shell, and banded with yellow on a black ground under- 
neath. It is not known to occur in any other part of the 
world than in the immediate neighbourhood of Launceston, 
Tasmania. 
The rest of the land shells consist of 2 species of Bulimus, 
3 of Vitrina, 2 or 3 of Succinea, and 3 or 4 of Truncatella. 
Bulimus Hufresnii is the finest of the two species, being 
about an inch long and well marked in its colourings 
and style. The Vitrina is represented by two very fine 
species, large in size, black in colour, and highly polished, 
giving the shell a lacquered appearance. The animals are 
of a bright red colour. The Succinea are very typical of the 
genus generally. 
The fresh-water shells number 36 species, comprised in 14 
genera as follows : Lymnsea 3, Physa 9, Planorbis 3, Ancy- 
lus 3, Gundlachia 1, Pomiatopsis 1, Bythinia 7, Amnicola 1, 
Unio 1, Cyclas 1, and Pisidium 2. They are nearly all 
small in size, the largest genera much resembling our British 
species, except the Bythinise, which are more like our 
own Hydrobise. 
