22 A MONOGRAPH OF 



pressed ; spire a little elevated, obtuse at the apex ; aperture almost 

 circular ; margins closely approaching ; peristome simple ; columellar 

 margin faintly dilated. 



Diameter, greatest 2 ; height 1 mil. 



Habitat. — Furneaux Group and Watei house Island, Bass Straits, 

 Circular Head, Emu Bay, Torquay. 



At the first locality it was gathered in depressions on the sand dunes 

 with H. Barrenensis and H. 2)ictilis. A minute species with some re- 

 semblance to H. Haiti, but from which it differs by its larger size, less 

 elevated spire, and more open umbilicus. It has a close resemblance 

 to the preceding, but is not nearly so highly polished, has a larger 

 number of whorls, and the lines of growth are much more apparent 

 under the lens. 



32. — Helix ( ) Halli. — Cox. 



Legrand's Col. for Mon., sp. 34, pi. ii., fig. 9. 



Shell narrowly umbilicated, conoid, thin, pale yellowish-brown ; 

 very finely striated ; whorls 4 J to 5, regularly increasing in size, 

 rounded ; suture deeply impressed ; spire conically elevated ; aperture 

 lunately-oval ; peristome simple, thin ; columellar margin expanded at 

 the base. 



Diameter, greatest 0'06, least 0-05 ; height 0*04 of an inch. 



Habitat. — Brown's River, "Waterworks and Domain, near Hobart 



Town ; Distillery Creek and Cataract, near Launceston j 



Gad's Hill, Middlesex Plains, near Valentine's Peak, 



Mount Bischoff, Torquay. 



This little species comes near H. microcosmos (Cox), from which it 



principally differs in colour and height. Its nearest analogue in this 



island is the sinistral H. Weldi, but it, of course, can never be mistaken 



for that species. 



33. — Helix ( ) parvissima — Cox. 



Legrand's Col. for Mon., sp. 39, pi. ii., fig. 1. 



Shell narrowly umbilicated, turbinately-globose, transparent, thin ; 

 pale yellow-brown, smooth, shining ; spire obtusely-conical ; Mdiorls 5 J, 

 convex, gradually increasing in size, last not descending in front ; 

 aperture irregularly lunate ; peristome simple, thin ; columellar margin 

 not expanded. 



Diameter, greatest 0*05, least 0*04 ; height 0*06 of an inch. 



Habitat.— 'Bvoy^B Biver, Mount Nelson, Waterworks, near Hobart 

 Town ; Distillery Creek, near Launceston ; Mount 

 Bischoff, Surrey Hills, Middlesex Plains. 



Somewhat resembling the last, but more conical and smooth. 



