62 AUSTRALIAN LAND SHELLS. 



not regularly, finely, inembranousby ribbed ; spire slightly promi- 

 nent, suture impressed ; whorls 4, regularly increasing, convex, last 

 slightly dofleoted in front ; base striated as above to the bottom of 

 the perspective umbilicus, which equals j of the diameter ; aperture 

 diagonal, nearly circular ; peristome thickened, expanded, slightly 

 reflected, white, margins nearly continuous. 



Diameter, greatest - 09 ; least 0-07 ; height 005 of an inch. 



Habitat. Petersham. Marrickville. Glehe. Craigend, and other 

 places about Sydney. Cox. 



A very neat little shell, of a delicate white, tinged with blue, and very 

 closely allied to the European H. costata of Midler. 



XXVI. SECTION THERSITES. Pfr. Vers. p. 141. 



* H. Eichmondiana. * H. Bidwilli. 



* H. MacGillivrayi. * H. delta. 



165. Helix Eichmondiana. Pfr. Elate VIII. Figs. 5 and 6. 

 Pfr., Pro. Zool. Soc., 1851, p. 252. 

 Reeve, Cone. Icon. sp. 365. 



Shell imperforate, broadly trochiform, solid, opaque, shining, closely 

 and irregularly, obliquely, finely striated and granulated, dark chest- 

 nut, reddish at the apex ; spire conical, rounded at the apex ; whorls 

 6, flattened, very gradually increasing, last slightly descending in 

 front, sharply keeled at the periphery ; base flat, aperture very 

 oblique, triangularly ovate, at the keel pointedly produced in front, 

 within glossy livid ; peristome thickened, chestnut or blackish-brown, 

 margins not approaching, joined with a thin callus, expanded and 

 slightly reflected, especially towards the columella. 



Diameter, greatest 2 "20; least 2 - 00; height l'OO of an inch. 



Habitat. Eichmond Eiver, N. S. W. Cox. 



Apparently confined to that district, where it occurs in plenty along 

 with H. Falconari, in the vast Cedar and Eine brushes, both keeping 

 under logs, &c, in dry weather. A pale variety of this fine species 

 is not uncommon, Eig. 6. The colour is reddish or yellowish, of 

 various degrees of intensity, with a narrow, dark, spiral band, and a 

 dark blotch in the umbilical region. 



156. Helix MacGillivrayi. Forbes. Elate II. Fig. 12. M.C. 

 Forbes, Voy. of Rattlesnake, Vol. II., p. 377. PI. III. Fig. 1. 

 Reeve, Cone. Icon. sp. 357. 



Shell imperforate, trochiform, rather thin, smooth, moderately shining, 

 very closely obliquely and spirally striated throughout, flesh coloured, 

 irregularly interspersed with minute dark, rounded dots ; spire 

 conical, apex acute, bluish-black ; whorls 5, flat, the last keeled, 

 suddenly descending in front, beneath the keel somewhat com- 

 pressed and convex ; mouth very oblique, sinuately and irregularly 

 triangular ; peristome thin, white within, surrounded by a dark 

 band, right margin arched, then forming a rounded projection, fol- 

 lowed by a rounded sinus, thence to the columella slightly curved, 

 collumella slightly ascending, callous, dark chestnut at the base. 



Diameter, greatest 0*90 ; least 0'75 ; height 0*67 of an inch. 



