AUSTRALIAN LAND SHELLS. ' 21 



pale red bauds ; spire small, slightly prominent, suture moderate ; 

 whorls 4^, slowly increasing, slightly convex, last regularly roundly 

 convex, not descending in front ; umbilicus equalling I- of the 

 diameter; aperture obliquely-lunate; peristome simple, thin, straight. 



Diameter, greatest 037 ; least G"33 ; height 0-14 of an inch. 



Habitat. Tasmania. Le Grande. 



The two specimens which I possess, and also the two in the collection 

 of the Rev. R. L. King, are imperfect in the mouth, so that I can 

 say nothing regarding the upper part of the columella. 



Pfeiffer, in Mon. Hel. Viv., Vol. IV., p. 94, says, the Helix coma of 

 Gray is a "New Zealand species, and that it is even found in Van 

 Piemen's Land." A reference to the description of H coma, in 

 Vol. III., p. 99 of the same work, indicates a very strong probability 

 that my Helix Diemenensis is the same. This, however, is only noted 

 now as a point to be attended to in due time, 



52. Helix retepora. Cox. Plate VII. Fig. 8, 8 a. natural size 

 and magnified. M.C 

 Cox, Pro. Zool. Soc, 1867, p. 39. 



Shell perforated, depressly-orbicular, rather solid, not shining, very 

 closely, strongly and almost regularly ribbed in a radiate, curved 

 manner, some of the ribs much more projecting than others, and at 

 somewhat regular intervals, the interstices crossed by minute and 

 close raised lines, giving under the lens the idea of network ; dull 

 reddish-brown; spire slightly prominent, flatly rounded, obtuse, 

 suture distinct; whorls 4.V, gradually increasing, slightly convex, 

 last roundly convex ; base sculptured as upper surface ; aperture 

 oblicpiely-lunate, enamelled within ; peristome simple, thin ; colu- 

 mella above triangularly dilated and reflected, half concealing the 

 rather small umbilicus. 



Diameter, greatest 0-19 ; least 0-18 ; height 0"07 of an inch. 



Habitat. Flinder's Eange, S. Australia. Masters. 



53. Helix Morti. Cox. Plate XI. Fig. 13, natural size and 

 magnified. M.C 

 Cox, Catalogue of Australian Land Shells, p. 22, 1864. 



Helix paradoxa. Cox, Catalogue of Australian Land Shells, p. 21, 186i 



Bather widely and deeply umbilicated, depressly-convex, irregularly 

 transversely ribbed, the interstices being decussately-punctately 

 striate ; slightly shining, translucent, horny-brown ; whorls 3 to 3^-, 

 moderately convex, the last rounded, not descending ; spire slightly 

 elevated, obtuse ; aperture roundly-lunate, margins approaching ; 

 peristome simple, the columellar border slightly everted. 



Diameter, greatest 0-08 ; least 0'07 ; height - 04 of an inch. 



Habitat. Green Oakes, Darling Point. Marrickville. Dawes Point, 

 and elsewhere about Sydney. Chatsworth. Campbelltown. Clarence 

 River. Clyde River. Dapto, in N. S. W. ; also S. Australia, W 

 Aiistralia, and Tasmania. Cox. 



