AUSTRALIAN LAND SHELLS. 53 



striated, more or less decussated with spiral lines, banded with dark 

 brown and yellow ; spire very slightly prominent ; whorls 4 to 5, 

 quickly increasing, slightly convex, last very wide, very bluntly 

 keeled, convex above, dilated and obliquely produce I, and in front 

 suddenly deflected; below more shining than above, of a deep 

 brownish-black from the periphery to the centre of last whorl, then 

 reddish-yellow to the bottom of the extremely wide and perspective 

 umbilicus ; aperture nearly horizontal, transversely lunately-oval ; 

 peristome purplish-black within, thickened, reflected, margins ap- 

 proximating and joined with a callus, right slightly curved, anterior 

 rather more so, columellar margin nearly straight, thickened above 

 with a callus. 



Diameter, greatest 2*60 ; least 2 , 00 ; height - 80 of an inch. 



Habitat. Brisbane, Wide Bay, Port Curtis, and Pockhampton, 

 Queensland. Cox. 



Of this very remarkable shell the preceding description applies to what 

 may be considered as the type, but it is extremely variable. In 

 size, my largest specimen measures 2 - 80, and my smallest (adult) 

 1*90 inches, in greatest diameter. The lip may be altogether white, 

 Fig. 5, or purplish-black, Fig. 5 a., or in fact of various tints 

 between white and purplish-blaek. Some enormous specimens from 

 Port Curtis are of a green colour as the prevailing hue, Fig 5, and 

 then have the lip very greatly thickened and reflected, with a copious 

 callous deposit between the margins. A series of specimens of a 

 small variety from Pockhampton, shew below a similar appearance 

 to that in the description, but above, the bauds, mostly narrow, are 

 very numerous and decided. 



135. Helix Muhlfeldtiana. Pfr. Plate VI. Fig. 2. M.C. 

 Pfr., Pro. Zool. Soc, 1851. 

 H. rotabilis. Peeve, Cone. Icon. sp. .361. 



Shell umbilicated, very much depressed, discoid, solid, scarcely shining, 

 rugosely striated, decussated by very indistinct spiral wrinkled lines, 

 blackish-chestnut, with obscure traces of bands ; spire scarcely pro- 

 jecting and sometimes flat ; whorls 5, rapidly increasing, very 

 slightly convex, last very wide, swollen, obliquely produced, and 

 suddenly deflected in front, bluntly keeled for one-half its length ; 

 below coloured as above, umbilicus \evy wide and perspective ; 

 aperture nearly horizontal, transversely ovately-lunar, margined 

 within with glossy dark purplish-black, with bluish interior ; peris- 

 tome simple, not thickened or reflected except on the columella, 

 margins approaching, connected by a callus, right arcuate, left nearly 

 straight, thickened and very slightly reflected above. 



Diameter, greatest 250 ; least 1*85 ; height - 70 of an inch. 



Habitat. Pichmond River. JIacGilk'vrag. 



Closely allied to the preceding species, but is smaller, and of a dull 

 generally uniform hue, with the lip thin. 



