TASMANIAN LAND SHELLS. 17 



22. — Helix ( ) pictilis — Tate. 



Pro. Linnaean Soc. N.S. Wales, vol. ii., page 290. 



Shell umbilicated, globosely-conical, keeled, thin ; ornamented with 

 distant, strong, unequal, regular curved ribs, the interstices crossed by- 

 minute and close raised lines, which produce in certain positions a satiny 

 lustre, coloured above with light chestnut and pale brown or colourless 

 segments ; spire broadly conical, obtuse ; whorls 5, flattish, the last 

 angulated, the carina denticulated ; base slightly sloping, finely ribbed, 

 coloured as above ; aperture angular, broadly-lunate ; peristome thin, 

 simple ; columellar slightly reflected ; umbilicus small. 



Diameter, 0'15 and 0*14 of an inch ; height, 0*125. 



Habitat. — " Among herbage on the slopes of the Cape Northumber- 

 land cliffs, South Australia ; also fossilized in the same ■ 

 rocks, which are induiated blown sands of Pleistocene 

 age, numerous examples." Furneaux Group, Bass 

 Straits (recent and fossilized) ; Ciicular Head to Emu 

 Bay. 



Prof. Tate remarks — " This species closely resembles H. j^enolensis, 

 { Cox), but differs particularly in its coarser ribbing, in its colouration, 

 and by the pi;esence of transverse stride." In the Furneaux Group it is 

 fossilized with another species oi Helix, apparently H. Wi'llvnufw'i'm'i't^r^'i Vast^i^/^L^; 

 niimbers of dead specimens were collected on the sand dunes in company fi7^^ 

 with H. Barrenensis, mihi, and H. Furneauxensis, miki, but no search was 

 made among the vegetation for living examples. It is closely allied to 

 H. ccesus (Cox), so much so that many specimens show a gradual 

 assimilation to that species ; in fact it may be but an extreme variation, 

 although I consider it distinct. The peculiar satiny aj)pearance 

 is noticeable in several of our Helices, and is very conspicuous in H. 

 Legrandi and H. limula, although they are very different from the 

 species in question. It is interesting to discover a species of such an 

 extended range, more especially as it is found on both the mainland of 

 Australia and on the islands in Bass Straits, in both a living and 

 fossilized condition. Typical specimens kindly sent me by Professor R. 

 Tate are exactly the same as those collected at Circular Head and Emu 

 Bay. 



23. — Helix ( ) Jungermannle. N. Sj:). 



Shell small, with a narrow, steep umbilicus ; thin ; obliquely, 

 strongly, and irregularly striated with lines of growth, and very in- 

 distinct traces of spiral lines'; brown, shining with a bronze-like lustre ; 

 spire moderately elevated, apex often coroded ; whorls 4|, muck 



