20 ON THE ANATOMY OF SOME TASMANIAN SNAILS, 



the following description : — Animal 35 mm. in total length and, 

 measured a little posterior to the tentacles, 6 mm. in breadth, and 

 the same in height; colour slate, sometimes with a yellowish 

 tinge on the body, darkening into black on the tentacles, greyish- 

 yellow on the sole of the foot and on the mantle-collar ; the 

 muzzle and anterior dorsal area (in short, 4 that space enclosed by 

 the two conspicuous furrows which run back from the lips to the 

 mantle, which I will call the facial area) are ornamented by long 

 narrow tubercles, arranged in about a dozen longitudinal rows, 

 the sides and tail are divided into irregular polygonal spaces, 

 which are partially subdivided and finely granulated ; the tail 

 tapers slightly, is rounded posteriorly, and never keeled ; the 

 tentacles are 10 mm. long, tapering gradually, finely granulated, 

 the bases 3 mm. apart, the terminal bulb is asymmetrical, being 

 only developed on the under side ; the genital orifice appears just 

 beneath the groove bounding the facial area, 5 mm. behind the 

 risrht oculiferous tentacle. Habits bold and active ; the tail is the 

 first portion to emerge from the mantle and the last to disappear 

 within it ; when the animal is in motion the axis of the shell is 

 oblique to that of the body, the initial whorl being carried on the 

 right side of the tail, which projects 2 or 3 mm. beyond it, the 

 penultimate whorl resting on a wide, smooth, saddle-like space. It 

 haunts the under side of logs, stones, fallen tree-ferns, &c, and 

 ranges over the whole island. Another animal, from the Kinga- 

 rooma district, measured, total length 46 mm., height 12 mm., 

 length of tentacles 15 mm. The egg has been described and 

 figured by Tenison- Woods (P.L.S.N.S.W., Vol. m., p. 91, pL vii., 

 fig. la.). Specimens of the egg of this species, which I received 

 from Mr. Petterd, do not quite accord with the observation 

 quoted ; they are regularly oval, not so rounded as the figure, 

 pure white, shining, minutely granular, the granulations viewed 

 through a lens recalling those on an emu's egg ; major axis, 

 11mm.; minor axis, 8 mm. Mr. Dyer tells me that they are 



