HELIX-IJADRA. 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 ; peristonie 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. T20, greater diam. 1'SO, lesser 1*50 inch. 



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

 River, under masses of dead leaves. 



H. mitchellce 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. PL 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 lisrht 



o 



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 6J, 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. 



