HELIX. 87 



slightly convex, slowly increasing, the last not descending, peri- 

 phery rather acutely carinated, base convex ; aperture pearly 



within. Diam. 19 mill. 



Moreton Say, Australia. 



H. HAMILTONI, Cox. PI. 16, figs. 69, 70. 



Moderately umbilicated, thin, closely subarcuately costulate, the 

 interstices very narrrowly thread-striate, decussated by slight, very 

 minute spiral lines, appearing a little granular, not shining, light 

 brownish corneous, suture impressed ; whorls 5, rapidly increasing, 

 plano-convex, the last subinflated, the last rounded, not descending. 



Diam. 13 mill. 



Tasmania. 



Evidently not a member of this group where it is placed by 

 Pfeiffer. 



H. BISULCATA, Pfr. PI. 17, figs. 41, 42. 



Widely umbilicated, somewhat solid, spirally and very minutely 

 obliquely striated, shining, yellowish chestnut, suture impressed ; 

 whorls 6 J, a little convex, the last much wider, periphery obsoletely 

 angulated, not descending in front, base plane, a little impressed 

 and sulcate in the middle, sub compressed around the umbilicus. 



Diam. 29 mill. 



Hab. unknown. 



Described as Tasmanian, but Mr. Petterd writes that it is un- 

 known there (Jour, of Conch., ii, 95), unless it be possibly a mons- 

 trosity of H. Launcestonensis, Reeve. Pfeiffer adds to his description 

 the observation that the specimen has a series of callous nodes 

 within the aperture, corresponding with the basal sulcus. 



Unfigured Species. 



H. BELLENGERENSIS, Cox. Bellenger River, Australia. 



H. BELLENGENENSIS, Brazier. Bellengeii River, 



The names are slightly diverse, but evidently refer to the same 

 locality ; the descriptions and dimensions differ. 



H. HOOKERIANA, Johnston. Tasmania. 



H. TRUCANINI and H. JUNGERMANNI^E, Petterd. Tasmania. 



H. NEGLECTA, Brazier. Tasmania. 



H. SERRATA, H. Adams. PL 17, figs. 43, 44. 



Widely, profoundly umbilicated, thin, subpellucid, slightly 

 shining, with elevated lirse, light yellowish, suture serrated ; whorls 



