TASMANIAN LAND SHELLS. H 



BuUmus Dufresni, and another variety of Helix, which stands to H. 

 Kingi (Brazier) as the present form does to H. Stephensi (Cox) : it is, 

 in fact, but a very large variety of that species. I have carefully ex- 

 amined a large number of specimens, and find they exactly agree in form 

 and structure to the typical form from Mount Wellington ; the only 

 difference is the great size of Du Cani. I retain it as a species until I 

 have an opportunity of comparing the animal, and examining the 

 lingual membrane. Mr. Legrand and Mr. Stephens consider that 

 it should rank as a distinct species. The latter gentleman obtained the 

 type specimen from Mr. Gould, formerly Government Geologist, who 

 tirst met with it at the Leven River. 



12. — Helix ( ) plexus — Cox. 



Legi-and, Col. for Mon., species 28, pi. i., fig. 10. 



J3". Irvince — Cox. 



Legraud, Col. for Mon., species 71. 



H. spoliata — Cox. 



Legrand, Col. for Mon., species 75. 



Shell turbinately-globose, deeply, openly, and rather narrowly 

 umbilicated, thin, dull, pale horny-lDrown ; sculptured with rather 

 irregular, prominent, arcuate ribs, widely separate, the interstices of 

 which are finely striated transversely ; whorls 5, apex raised, last whorl 

 reflexed for a short distance in front ; base convex, less prominently 

 ribbed and striated than above ; peristome sim))le, aperture oblique, 

 ovately-rounded ; margins approached, columellar margin a little dilated 

 at its insertion ; margins joined by a rather thick callus. 



Diameter, greatest 0*24, least 0*19 ; height, 0-20 of an inch. 



Habitat. — Rivers Piper, Forth, and Leven, Circular Head, Table 

 Cape, Ben Lomond, and Distillery Creek (near Laun- 

 ceston). 



Subject to the same variation in size, colour, and to a certain extent 

 shape, as H. i^tephensi (Cox), from which it is doubtfully distinct. I 

 retain the species for shells in which the sculpture is more prouiment 

 above than below, in short often entirely wanting at the base, and that 

 portion polished to a more perceptible extent than the upper surface. I 

 have only met with it on the Northern Coast, where it is widely scat- 

 tered, as may be noticed by the list of localities given in the habitat 

 above. Lingual membrane 2\ mil. long by 1 broad, teeth arranged in. 

 regular, straight rows, 140 rows of 70 -70. 



c2 



