20 A MONOGRAPH OF 



27. — Helix ( ) Hobarti — Cox. 



Mon., 1868, p. 22. 



Legi-and, Col. for Mon., sp. 5. 



Shell openly and deeply unibilicated, depressed ; dusky-brown ; 

 closely and regularly transversely-ribbed ; spire only slightly elevated, 

 principally produced by the depiession of the last whorl; whorls 4^, 

 rounded ; base convex, with a funnel shaped umbilicus ; aperture almost 

 round ; peristome simple ; margins closely approximating ; no evertion 

 of the columellar margin. 



Diameter, greatest 0*12, least 0*09 ; height, 0-05 of an inch. 



Habitat. — The Domain, Hobart Town ; Mount Nelson, Procter's 

 Road, and about Launceston ; Melbourne, Victoria ; Cape 

 Northumberland, South Australia (Tate). 



In dry places under and attached to stones. The colouration of the 

 figures in Cox's Monograph is not correct ; the red and brown segments 

 were taken from the H. Luckmani of Brazier, which had apparently, up 

 to that time, been confounded with the present species, and to which it 

 is closely allied, although it can be easily separated by attending to the 

 description. It closely resembles a little shell that is common about 

 Melbourne, Victoria. 



The specimens from Cape Northumberland Prof. Tate has named 

 H. arenicola. 



28. — Helix ( ) Morti — Cox. 



Catal. of Aus. Land Shells, 1864, p. 22. 

 Mon., 1868, p. 21, pi. xL, fig. 13. 

 Legrand, Col. for Mon., species 17. 



Shell rather widely and deeply unibilicated, depressly-convex, 

 irregularly transversely ribbed, the interstices being decussately- 

 punctately striate ; slightly shining, translucent, horny-brown ; whorls 

 3 to 3 J, moderately convex, the last rounded, not descending ; spire 

 slightly elevated, obtuse ; aperture roundly-lunate ; margin approaching ; 

 peristome simple ; the columellar border slightl}'" everted. 



Diameter, greatest 0'08, least 0*07 ; height, 04 of an inch. 



Habitat. — New South Wales, South and West Australia, Moimt 

 Wellington, near Launceston, the Domain (Hobart Town), 

 Mount Nelson, Emu Bay, and Torquay. 



Cox remarks of this species — " The lij^s are sometimes faintly 

 joined by a callus, and the shell exhibits variation in the distinctness of 

 its arched ribs, which are sometimes obsolete." I have not had an 

 opportunity of examining authentic Australian specimens, those col- 

 lected in this island and what I have always considered the typical form 

 of this species vary gradually, on the one hand to Cox's Hobarti, and on 



