HELIX-HADRA. 159 



lar lip half-covering the broadly opening umbilicus. 



Alt. 22, greater diam. 26, lesser diam. 22 mill. 



The 0' Connell River, Port Denison, Queensland, Australia. 



H. O'ConnellensisCox, P. Z. S. 1871, p. 55, t. 3, f. 4, 4a, Pfr. 

 Monographia, vii, p. 385 ; Conchyl. Cab. p. 547, t. 165, f. 12-14. 

 H. albofilata Mouss. Mus. God. Cat. v, p. 94. 



Smaller than H. rainbirdi, and differently colored. 



H. ARTHURIANA Cox. PI. 36, figs. 21, 22. 



Shell globosely depressed, largely and openly umbilicated, very 

 dark chestnut, almost black, lighter at the apex, transversely finely 

 striated ; whorls 6, very gradually increasing in size, last sharply 

 depressed in front; suture conspicuously margined below with 

 white ; spire bluntly convex ; base somewhat flattened ; aperture 

 ovately lunate, livid within, margins closely approximate, joined by 

 a thin callus ; peristome straight, expanded and reflexed, of an 

 intensely dark livid purple color ; columellar margin triangularly 

 dilated, overhanging the umbilicus. (Cox.) 



Diam., greatest 1'28, least O90 ; height 0'77 of an inch. 



L. Island, near Broadsound, lat. 20 52', E. long. 149 37'. 



H. (Camcena) arthuriana Cox, P. Z. S. 1873, p. 564, t. 48, f. 1, 

 la. PFR. Mon. Hel. Viv. vii, p. 393. HEDLEY, Proc. Roy. Soc. 

 Queensl. 1889, p. 102. 



More closely allied to H. oconnellensis than to any other species. 

 It is more globose, and it has not the excavated base round the 

 umbilicus so characteristic of that species; the aperture is also 

 mere round, with the margins more approximated. (Cox.) 



H. ROCKHAMPTONENSIS Cox. PI. 21, figs. 48, 49. 



Shell umbilicated, globose-trochoidal, the spire convexly elevated, 

 base decidedly flattened ; of a dark chestnut color, encircled on 

 periphery and base with a number of narrow yellowish bands and 

 lines ; sutural light margin indistinct or wanting, lip deep purplish- 

 brown, dilated half over the funnel-shaped umbilicus. 



The form is elevated, like H. crofloni etc., but distinctly flattened 

 on the base, much more so than in If. rainbirdi etc. Whorls 6, 

 scarcely convex, the last one descending in front. Aperture very 

 oblique, lilac within, the broadly expanded lip dark purplish-brown, 

 very much dilated at the columella, more than half covering the um- 

 bilicus, which is deep and funnel-shaped. 



Alt. 32, greater diam. 34}, lesser 29 mill. 



Rockhampton, North-eastern Australia. 



