AUSTRALIAN LAND SHELLS. 17 



scarcely oblkxue, roundly-lunate, Pfr. , nearly circular, Peeve ; 

 peristome simple, straight, margins somewhat approximating, 

 columellar margin scarcely dilated, shortly reflected. 



Diameter, greatest 0*16 ; least 0'15 ; height 0"06 of an inch. 



Habitat. Perth, Western Australia. Bacon. 



Like the preceding, this description is not original, but extracted from 

 Pfeiffer's Jlon. Hel Viv., Vol. IV., p. 89, and from Eeeve, who 

 states it to be a " light horny species, delicately encircled with fine 

 ring-like ribleis." Benson says it is ''like II. sublesta and H. 

 iuloidea. " 



41. Helix iuloidea. Forbes. Plate XI. Fig 19, natural site and 

 magnified. M.O. 

 Forbes, Yoy. Rattlesnalce, Vol. II., p. 379. PI. II. F. 4. 



Reeve, Cone. Icon. sp. 1464. 



Shell umbilicated, depressly- orbicular, rather thin, regularly and 

 closely finely ribbed, reddish-horny ; spire fiat, excavated in the 

 centre, suture deep ; whorls 4, convex, last rounded, rather tumid, 

 not descending in front ; umbilicus wide, deep and perspective, 

 equalling \ of the diameter ; aperture very nearly vertical, lunate, 

 higher than wide ; peristome simple, thin, angulated near the body 

 whorl. 



Diameter, greatest O'lo ; least 0"13 ; height O'Oo of an inch. 



Habitat. Port Molle, North Australia. llacGillivray. Clarence River, 

 &c. Cox. 



Although varying in size and colour for I have received not only very 

 pale, but even pure white varieties from the Clarence River also 

 in the degree of excavation of the spire, it is a shell of very easy 

 recognition. 



42. Helix Belli. Cox. Plate VI. Fig. 3, natural size and mag- 

 nified. M.C. 

 Cox, Catalogue of Australian Land Shells, p. 22, 18G4. 



Shell umbilicated, depressed, ^discoid, thin, transparent ; regularly, 

 very closely, and very finely marked with thread-like stria?, varying 

 in colour from pale-horny, and reddish-yellow, to reddish-chestnut, 

 slightly shining; spire flat, sometimes slightly concave; suture deeply 

 impressed ; whorls 5, very gradually increasing, convex, the last 

 narrow, rounded, rather dilated below, not descending in front ; 

 below linearly marked as above, rather suddenly merging into the 

 deep perspective umbilicus, which is nearly j? the width of the 

 shell ; aperture lunate ; peristome simple, thin, outer margin 

 slightly curved. 



Diameter, greatest 0-08 ; least G"07 ; height 0-03 of an inch. 



Habitat. Green Oakes, Darling Point, Sydney. Bell. 



A minute, very much depressed, finely striated, brownish shell, not 

 resembling any other Australian species. 



