HELIX-HADRA. 173 



nearly closing the umbilicus ; parietal wall with a very thin layer of 

 brownish callus. 



Alt. 25, greater diam. 30 mill. 



Alt. 23, greater diam. 25 J mill. 



Alt. 21, greater diam. 27 mill. 



Port Molle and islands off Port Denison, Queensland. 



H. yulei FORBES, in Appendix to narrative of the Voyage of 

 H. M. S. Rattlesnake, p. 377, t. 2, f. 6, 1852. PFR. Monographia 

 Hel. Viv. iii, p. 224 ; Conchyl. Cab. p. 547, t. 165, f. 8, 9. REEVE, 

 Conch. Icon. f. 1447. Cox, Monog. Austr. L. Sh. p. 57, t. 5, f. 3. 

 HEDLEY, Proc. Roy. Soc. Queensl. 1888, p. 62. 



Very much like H. incei in stature and coloration, but separated 

 from incei, whartoni, appendiculata, lessoni, etc., by the dark- 

 edged lip. The umbilicus is more contracted by the overhanging 

 lip than in the species named. The circular umbilical dark tract 

 is also characteristic and constant. The dimensions given show how 

 the form and size vary. The striping is very variable ; a form 

 striped differently from the type is figured on pi. 23, figs. 65, 66. 



H. CHALLISI Cox. PI. 36, fig. 23. 



Shell solid, heavy, umbilicated, depressedly orbicular, closely, 

 finely, striated, of a waxy yellow color, ornamented by six or more 

 rather narrow dark chestnut bands of irregular sizes and distances 

 apart, dark around the umbilicus ; spire moderately raised, bluntly 

 convex, whorls 7, convex, very gradually increasing in size, last 

 shortly deflected in front ; aperture ovately lunate, margins slightly 

 approximating, joined by a thin callus, interior of aperture showing 

 dark lines of ornamentation ; peristome straight, pure white, slightly 

 thickened and reflexed, columellar margin triangularly expanded, 

 half covering the rather narrow umbilicus. ( Cox.} 



Height 0*90, greatest diam. 1*22, least 0'89 of an inch. 



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



H. (Camasna) Challisi Cox, P. Z. S. 1873, p. 565, t. 48, f. 3. 

 PER. Mon. Hel. Viv. vii. 



Compare H. appendiculata , yulei, incei, whartoni, etc. 



H. NICOMEDE Brazier. PI. 47, fig. 87. 



Shell umbilicated, depressly globose, very thin, shining, distinctly 

 obliquely striated and granulated throughout, light-brown, encircled 

 with one pale yellowish band just showing above the suture ; whorls 



