HALIOTIS. 117 



cords cut by close minute striae of increment, and having radiating 

 waves or folds above ; a slight angle at the row of perforations, be- 

 low it broadly excavated and then carinated ; perforations about 6, 

 elevated, circular. 



The outline is suborbicular, much depressed ; solid but not thick ; 

 surface either dark red with few radiating angular white patches, or 

 dull red and green, streaked and mottled. The spiral cords of the 

 outer surface are either nearly equal, or have slightly larger ones at 

 wide intervals ; they are decussated by close growth-striie. Whorls 

 a trifle over 3. Inside corrugated like the outer surface, silvery, 

 very brilliantly iridescent, the reflections chiefly sea-green and red. 

 Columellar plate broad, flat, obliquely truncated at base. Cavity of 

 spire wide, open, but shallow. 



Length 120, width 90, convexity 28 mill. 



Australia. 



H. ncevosa MARTYN, Univ. Conch., t. 63. REEVE, Conch. Icon., f. 

 27 a, b, c. SOWERBY Thes. Conch, v, t. 10, f. 73. WEIXKAUFF, 

 Conchyl. Cab., p. 34, t. 14, f. 1, 2, 3.H. clathrata REEVE, Conch. 

 Icon., f. 72. SOWERBY, Thes. Conch, v, t. 6, f. 39. 



This is a variable form, in color varying from dark coral red to 

 dull red streaked with pale green. The young have been re-named 

 H. clathrata by Reeve (see pi. 5, fig. 26). 



Reeve gives the localities Tasmania, New Zealand and Bohol, 

 Philippines, in addition to Australia. The Philippine Island local- 

 ty is for clathrata. 



H. ROEI Gray. PL 18, fig. 1 ; pi. 48, figs. 11, 12, 13. 



Shell short-oval, distance of apex from nearest margin somewhat 

 over one-fifth the greatest length of shell; sculpture consisting of 

 strong unequal spiral cords crossed by radiating folds. Perfora- 

 tions 7 to 9, nearly circular, rather small. 



The right side is straighter than the rounded left margin, and the 

 back depressed ; color scarlet-red, more or less marbled with olive- 

 green, painted with broad white rays. The spiral riblets are num- 

 erous, unequal, separated by deeply cut grooves, their summits cut by 

 fine radiating strice ; they are further rendered uneven by more or less 

 developed folds radiating from the suture. The spire is rather 

 elevated. Inside silvery, very iridescent, with pink, green and steel- 



