TASMANIAN LAND SHELLS. 41 



whorls 3|, last increasing, convex, slightly depressed above at the mouth, 

 inflated outwardly, slightly descending in front, base convex, faintly 

 marked with indistinct striae of a reddish-horn colour : umbilicus mode- 

 rately large ; aperture nearly diagonal, almost ovately-lunate ; peristome 

 simple, thin ; mai-gins approximating, right flexuous, basal slightly re- 

 flected at the columellar. 



"Variety a. — Striated with red or chestnut. 



Variety h. — Shell exactly double the dimensions of typical. 



Diameter, greatest 0-15, least 0*11 ; height, 0*06 of an inch. 



Habitat. — Mount Nelson, Recherche Bay, Port Davey, Brown's 

 Biver ; Distillery Creek and Cataract, near Launceston ; 

 Biver Leven, Blue Tier (A. Simson), Chudleigh, Gad's 

 Hill, Middlesex Plains, Lake Lea, Surrey Hills, Mount 

 Bischofi". 



A glassy, highly polished little shell, and on that account not to be 

 gasily mistaken for any other species. Generally of a clear yellowish- 

 creen colour, although it is often met with more or less rayed with 

 ehestnut and red. Southern specimens are in general smaller than those 

 I have collected in the vicmity of Launceston. In general aspect it 

 comes near H. Dyeri (mihi), but that shell is not umbilicated, therefore 

 it cnanot be well mistaken for it. Allied to^. splendidula (Pfr.) from 

 New South Wales and southern Queensland, and northern examples, 

 from their large size, have very much the aspect of that species. This 

 is one of several instances of the larger size or greater development of 

 many of our land shells in the north to what they normally attain in the 

 south. Several other instances could be cited, more especially H. Stephensi, 

 H. ruga, and H. TrwAir]iiiifii]jimi\ , 



65. — Helix ( ) antialba — C. E. Beddome. 



Pro. E.S.T., April, 1879. 



Shell umbilicated, concave on both sides, thin, covered with thread- 

 like riblets, not shining, white to brown ; spire deeply concave, nearly 

 meeting the umbilicus ; whorls 6|^, slowly increasing, convex, last 

 J ounded, higher than broad, below ribbed as above ; umbilicus perspec- 

 tive, deep, about one-third of the diameter of shell ; aperture semi-lunar ; 

 peristome simple ; columellar margin smooth and shining. 



Varietv a. — Brown. 



V 



Diameter, greatest 2|, least 2 ; height, 1 mil. 



Habitat. — Gad's Hill and Mount Bischoff, found in and under 



G 



