264 HELIX-CHLORITIS. 



H. MANSUETA Pfeiffer. PI. 33, figs. 64, 65. 



Shell depressed, umbilicated, spire low, obtuse, periphery rounded ; 

 chestnut or cinnamon brown, scarcely shining, all over granulated, 

 the granules very minute, separated, equidistant, less obvious beneath ; 

 suture evenly and deeply impressed from apex to the deflexed ter- 

 mination of the last whorl ; outer lip slightly expanded, flesh-col- 

 ored, columella white, reflexed partly over the umbilicus, which is 

 obliquely excavated behind the lip. 



The form is a little more depressed than H. porteri. Rather thin 

 but moderately strong ; spire low, apical whorl planorboid ; whorls 

 4, quite convex, the last deeply descending in front ; surface cov- 

 ered with minute points, but not hairy. As in the allied species, 

 even the apex is sculptured. Aperture flesh-colored inside ; whorl 

 slightly constricted behind the lip ; growth-striae fine and weak, not 

 stronger at the suture. Terminations of the peristome decidedly 

 converging, the aperture assuming a transversely oval form. 



Alt. 11, greater diam. 16J, lesser 14 mill. 



Moreton Bay, Queensland; Richmond River, N. S. Wales. 



H. mansueia PFR., P. Z. S. 1854, p. 57; Monogr. iv, p. 290; 

 Conchyl. Cab. p. 534, 1. 163, f. 7-9. REEVE, Conch. Icon. f. 1304. 

 Cox, Monogr. Austr. L. Sh. p. 59, t. 2, f. 4. 



More broadly umbilicated than H. porteri, and although studded 

 with minute points, there are no true hairs. 



H. BLACKALLI Brazier. Unfigured. 



Shell deeply, rather largely and openly umbilicated, globosely 

 depressed, very thin, translucent, light brown, irregularly striated 

 with raised waved striae, irregularly studded with numerous close- 

 set, obtuse, short bristles ; whorls 5, roundly convex, the last large, 

 in front largely inflated, base roundly convex, smoother than upper 

 surface, aperture broadly oval, peristome thin, slightly reflexed, 

 right margin descending, columellar margin expanded and partly 

 covering the large umbilicus. (Brazier.') 



Alt. 5J, greater diam. 8, lesser 7 lines. 



Mount Dryander, Port Denison, Queensland. 



H (Dorcasia) Blackalli BEAZ. Proc. Linn. Soc. N. S. Wales, i, 

 p. 1, 1875. 



This species resembles H. brevipila Pfr. and H. coxeni Cox in 

 being covered with fine hair epidermis. (1?.) 



