TASMANIAN LAND SHELLS. 19 



25. — Helix ( ) Trucaninl N. Sp. 



Shell perforated, depressly-convex ; of a deep, ricli brown, shining ; 

 obliquely striate throughout, with lines of growth, many of which are 

 distantly, irregularly prominent, crossed by fine, minute spiral striae, 

 giving the shell, under the lens, a granular appearance ; whorls 4, convex, 

 impressed at the suture ; apex obtuse and rounded, descending very 

 little in front ', periphery rounded ; base convex, sculptured the same as 

 upper portion ; perforation small and deep ; mouth lunately-rounded, 

 lip thin, acute , margins distant, joined by a thin, smooth, polished 

 callus ; columellar margin dilated, almost concealing the perforation. 



Diameter, greatest 2 J, least 2 ; height, If mil. 



Habitat. — Near First Basin, Launceston ; among moss on the 

 branches and trunks of trees, also more sparingly on rocks 

 overgrown by mosses. 



Although allied to H. Luchniani (Brazier) and H.jungermanice, niihi, 

 it is nevertheless distinct, and may be separated by its smaller size, 

 difierent colour, and by the umbilicus, which is very small and almost 

 concealed. 



It is of gregarious habit, and nestles in the masses of moss over- 

 growing trees and rocks, more especially is it plentiful on the former in 

 company with H. mimosa, mihi. 



. 26. — Helix ( ) Luckmani — Brazier, 



Pro. Koyal Soc. Tas., 1876. 

 H. neglecta — Br. 



Pro. Zool. Soc, 1870, p. 660. 

 Legrand's Col. for Mon., sp., 47. 



Shell umbilicated, depressly convex, thin ; obliquely, faintly, and 

 irregularly striated ; whorls regularly marked above with alternate 

 light-red and brown segments ] whorls 4|^, convex, excavated at the 

 suture, the last not descending in front ; base convex, brown ; umbilicus 

 deep ; aperture roundly-lunate ; lip thin, acute ; margins nearly 

 approximating ; columellar margin not reflected. 



Diameter, greatest 0'13, least 0*11 ; height 0*08 of an inch. 



Habitat. — Knocklofty, Mount Kelson, foot of Mount Wellington, 

 > Distillery Creek, and Cataract (near Launceston). 



Differs from all others by its dingy appearance, and. the segments of 

 colour on the upper surface are very characteristic. In form it is allied 

 to H. sitie7is and H. JungermctnnicB, but their respective specific differences 

 are so constant that no confusion need occur in the identification. 

 Heretofore this shell was supposed to be confined to the southern por- 

 tion of the island, but T have recently found it in great profusion in the 

 vicinity of Launceston, where it. is more especially plentiful among 

 mosses on the rocks around the First Basin, and also near the Waverley 

 Woollen Mill at Distillery Creek. 



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