4 AUSTRALIAN LAND SHELLS. 



irregularly and rather closely striately ribbed, some of the riblets 

 more prominent than others, interstices very minutely striated and 

 granulated, reddish-horny ; spire obtusely convex ; suture rather 

 impressed ; whorls 4, convex, slowly increasing, last convexly- 

 rounded ; base rather convex, which is more glossy, and less promi- 

 nently ribbed than above, umbilicus minute ; aperture oblique, 

 somewhat squarely -lunate ; peristome simple, outer lip slightly 

 curved, lower more so, and columella nearly straight, slightly 

 thickened and reflexed above. 



Diameter, greatest 006 ; least 0*04 ; height 030 of an inch. 



Habitat. Stroud. King. Darling Point and Shark Bay, Sydney. 

 Gore's Hill, Lane Cove, N. S. W. Brazier. 



The most minute of the Australian Helices known to me. It can be 

 easily recognised by attending to the characters. 



II. SECTION EHYSSOTA. Pfr. Vers. p. 121. 



* H. pudibunda. * H. subrugata, Pfr. * H. Moretonensis. 



6. Helix pudibunda. Cox. Plate II. Fig. 1L M.C. 



Shell perforated, depressly-turbinate, thin and transparent, very 

 smooth, shewing under the lens very faint curved Hues, and traces of 

 still fainter spiral Hues, shining, pinkish or flesh coloured; spire 

 broadly conical, rather acute ; whorls 6, flatly convex, last not 

 descending in front, the periphery shewing nearly obsolete traces of 

 a keel, below convex, glossy, generally opaquely milky-white about 

 the umbilicus, which is minute and shallow ; aperture diagonal, 

 somewhat squarely-lunar, pearly within; peristome simple, acute, 

 columellar margin very slightly triangularly dilated and reflected 

 above. In old age, white and callous. 



Diameter - 65 ; height 0'55 of an inch. 



Habitat. Eichniond Eiver. MacGillivray. Moreton Bay. Masters. 



The smoothness, want of carina, pinkish colour, and callous columella 

 are the chief points of distinction between this and BZ. Moretonensis 

 and DT. subrugata. 



7. Helix subrugata. Pfr. Plate IX. Fig. 2 natural size, 2 a., 

 2 b. magnified. M.C. 

 Pfr., Pro. Zool. Soc, 1851, p. 259. 



Helix Clarencensis. Cox, Pro. Zool. Soc, 1864, p. 594. 



Shell slightly perforated, depressly-turbinate, very thin, smooth, 

 transparent, shining, white, olivaceous, or yellowish-horny, finely 

 and irregularly arcuately striated, and under the microscope 

 closely spirally striated ; spire shortly conical, rather acute ; whorls 

 6, very flatly convex, last very slightly descending in front, very 

 obtusely carinated ; base rather convex, shining, with radiating 

 faint .lines ; aperture diagonal, very slightly angularly rounded ; 

 peristome simple, acute, externally bluntly angular, columellar 

 margin above shortly triangularly dilated, scarcely reflected. 



Diameter, greatest 0'42 ; least - 40 ; height - 25 of an inch. 



Habitat. Clarence Eiver, &c. MacGillivray. 



After comparing a large number of specimens, I have satisfied myself 



