AUSTRALIAN LAND SHELLS. 15 



with fine parallel lines not decussated, reddish-horny ; spire flat, 

 suture deeply impressed ; whorls 5, very regularly increasing, last 

 equally rounded above and below ; base marked as upper surface, 

 the ribs running into the umbilicus, which is wide, perspective, and 

 equalling of the diameter ; aperture slightly oblique, lunate, 

 peristome simple, acute. 



Diameter, greatest 0' '14; least 0*12 ; height 0-05 of an inch. 



Habitat. Rushcutters' Bay, Darling Point, Craigend, &c, near 

 Sydney, New South Wales. Cox. 



A shell easily distinguished from its allies by attention to the 

 description. 



35. Helix lirata. Cox. Plate XL Fig. 3, natural siz? and 

 magnified. M.C. 

 Cox, Catalogue of Australian Land Shells, 1864, p. 38. 



Shell umbilicated, flatly discoid, thin, strongly and regularly, not con- 

 fusedly, ribbed, the ribs rather distant, with, under the lens, the 

 interstices occupied by thread-like lines, decussated under a higher 

 power with still fainter lines, horny brownish chestnut ; spire flat 

 or very slightly submerged ; whorls 3, last very regularly rounded 

 above and below ; base with ribs and thread-like lines as above, 

 umbilicus perspective, J the width of the shell ; aperture vertical, 

 semilunar ; peristome simple, thin, regular. 



Diameter, greatest - 10 ; least 0-09 ; height 0*05 of an inch. 



Habitat. Rushcutter Bay, near Sydney. MacGillivray. 



The nearest ally of this shell is H. Saturni, but the two need never be 

 mistaken when brought together. 



36. Helix Adelaidse. PJr. 



Pfr., Pro. Zool. Soc, 1856, p. 387. 



Shell umbilicated, depressed, keeled, rather thin, striated, white above 

 with a brownish band ; spire scarcely elevated, rather blunt at the 

 apex, horny ; whorls 4, slightly convex, last not descending, some- 

 what sharply keeled above the periphery, inflated at the base ; 

 umbilicus perspective, nearly equalling ^ of the diameter ; aperture 

 almost diagonal, lunately-rounded, scarcely angular at the keel; 

 peristome straight, very slightly lipped within, margins converging, 

 columella somewhat spreading. 



Diameter, greatest 24 ; least 0-20 ; height 0*12 of an inch. 



Habitat. Adelaide, South Australia. Cuming. 



37. Helix albanensis. Cox. Plate IV. Fig. 2, natural size 

 and magnified. M.C. 



Shell umbilicated, depressly-convex, arcuately, closely and sharply 

 ribbed, not shining, yellowish, with numerous short radiating 

 reddish-brown bands ; spire moderately conoid, obtuse, suture well 

 marked ; whorls 5, slowly increasing, rather convex, last rounded 

 and somewhat inflated towards the mouth ; umbilicus perspective, 



