HELIX-HADRA. 155 



convex, obtuse ; whorls 6?, very regularly increasing, convex, last 

 deflected in front, convex below ; aperture very oblique, truncately 

 elliptical, within of a pearly bluish tint ; peristome thickened, lipped 

 within, reflected, inner edge glossy, chestnut black, margins connected 

 with a thin dark callus, anterior rather sinuated near the periphery, 

 columellar margin flattened, with a very prominent inner lip, hav- 

 ing an obsolete tooth-like callosity near the centre. ( Cox.) 



Alt. 1-20, greater diam. 1-80, lesser 1'50 inch. 



Clarence River, N. S. W. ; Beach Hut, Emigrant Creek, Richmond 

 River, under masses of dead leaves. 



H. mitchellcB Cox, Cat. Austr. L. Sh., p. 19, 1864 ; Ann. Mag. N' 

 H. 3d ser., xiv, p. 181 ; Mon. Austr. L. Sh., p. 65, t. 9, f. 9. PFR. 

 Monog. Hel. Viv. v, p. 279. 



Differs from most of the true Sphcerospira in the distinctly gran- 

 ulate or reticulate surface-sculpture ; most of the species being nearly 

 smooth. 



H. GRATIOSA Cox. PI. 40, figs. 88, 89. 



Shell imperforate, globose-elevated, yellowish brown or purple- 

 brown, with two rather broad dark bands, one just below the sutural 

 yellow lines, the other above the periphery ; a dark umbilical patch ; 

 whorls of the spire lighter, bifasciate with chestnut. 



This is a form very similar to H. blomfieldi in general contour, 

 and form of the basal lip and columella ; but smaller and differently 

 colored. It has a yellowish-brown ground-color, typically ; but on 

 the body- whorl this is sometimes of a very dark brown, almost 

 black. The dark bands described above are dark chestnut on light 

 examples, but become black on dark ones, and even then are scarcely 

 visible on the deep brown ground-color. There are sometimes a 

 few dark oblique streaks also, and the subsutural yellow or whitish 

 stripe is conspicuous. Whorls 6, the last less deeply deflexed in 

 front than most blomfieldi. Aperture oblique, blackish-brown inside, 

 with a pearly luster; lip very dark colored, well expanded, sud- 

 denly dilated at the columella and covering the umbilicus with a 

 closely adherent, triangular shiny callus. 



Alt. 33, greater diam. 27, lesser 25 mill. 



Whitsunday Island, off Port Denison, Queensland, Australia. 



H. gratiosa Cox, P. Z. S. 1871, p. 53, t. 3, f. 1, la. PFR. Monogr. 

 Hel. Viv. vii, p. 322 ; Conchyl. Cab. p. 545, t. 165, f. 4, 5. 



