266 HELIX-CHLORITIS. 



H.brevipilaPFR.,P. Z. S. 1849, p. 130; MOD. Hel. Viv. p. 

 REEVE, Conch. Icon. f. 777. Cox, Mon. Austr. L. Sh. p. 47, t. 5, 

 f. 2a, 2b. 



A very small, fragile species, seen under a lens to be densely cov- 

 ered with fine short hairs. The shell varies much, the spire being 

 at times much flattened, at others more elevated and acute. In 

 large specimens the hairs are absent. The facts of its distribution 

 are taken from Dr. Cox's account. 



H. ARIDORUM Cox. PI. 58, figs. 31, 32, 33. 



Shell small, umbilicated, of a depressed form, the spire low, sutures 

 deep, periphery rounded ; pale yellowish horny, thin, transparent, 

 microscopically granulated ; lip thin, a trifle expanded, the col- 

 umellar lip dilated half over the umbilicus. 



A small, thin shell with rather small deep umbilicus ; spire low ;. 

 the entire surface, even to the tip of the spire is microscopically 

 granulated, but the base is smoother, more shining ; the granulation 

 is prominent within the umbilicus. Whorls 4, very convex, 

 separated by exceptionally deeply impressed sutures, the last whorl 

 gradually descending a little in front, rounded at periphery. Aper- 

 ture rounded-lunar ; peristome thin, very narrowly expanded, not 

 thickened, the columellar margin dilated triangularly, half-covering 

 the umbilicus. Alt. 10, greater diam. 13?, lesser Hi mill. 



Clarence River ; Fitzroy ^Island and Brisbane, Australia* 



H. aridorum Cox P. Z. S. 1867, p. 724 ; Monogr. Austr. L. Sh., 

 p. 44, t. 11, f. 16. PFR. Monogr. v, p. 351. BRAZIER, Proc. Linn, 

 Soc. N. S. W. i, p. 123. HEDLEY, Proc. Roy. Soc. Queens!. 1888, 

 p. 54. TRYON, Manual iii, p. 217, t. 50, f. 34, 35. 



A larger species than (the closely allied H. brevipila, and not 

 velvety but granulate. The sutures are quite deeply impressed. 



H. OCCULTA Pfeiffer. PI. 58, figs. 25, 26, 27. 



Shell narrowly umbilicated, globose-depressed, thin, under a lens 

 seen to be everywhere very minutely granulated, brownish ; spire 

 slightly elevated ; whorls 4, a little convex, the last wide, deflexed 

 and a little constricted in front, more ventricose on the base; 

 aperture large, oblique, lunate-oval ; peristome white-calloused, 

 margins approximating, the outer margin expanded, basal reflexed, 

 dilated above the umbilicus. 



Alt. 7, greater diam. 12, lesser 10 mill. 



