HALIOTIS. Ill 



but several (generally three) strong spiral ribs. Spire a little ele- 

 vated, whorls 3. Inside corrugated like the exterior, silvery with 

 blue, green and red reflections, the latter predominating. Columel- 

 lar plate narrow. 



Length 94, width 71, convexity about 30 mill. 



Length 82, width 56, convexity 22 mill. 

 Omaha to Duuedin, iV r . Zealand; Chatham and Auckland Is.; S. 



Australia. 



H. rugoso-plicata Chem. Conchyl. Cab. x, p. 311, t. 166, f. 1604, 

 1604«. — Reeve, Conch. Icon., f. 7. — Sowerby, Thes. Conch, v, p. 

 21, f. 9, 10, 53.— Weinkauff, Conchyl. Cab., p. 15, t. 6, f. 5, 6.— 

 H. australis Gmel., Syst. Nat., p. 3689. — H. ruber Leach, Zool. 

 Misc. i, p. 54, t. 23, teste Dillwyn. — H. costata Swainson Appen- 

 dix Bligh Cat., p. 3. 



The corrugated exterior is quite constant and characteristic. 

 Young specimens are more strongly ribbed spirally, and often have 

 radiating stripes of red on a delicate green ground. 



Group of H. marlii . 



H. marine Gray. PI. 19, figs. 10, 11. 



Shell large, oval, convex, distance of spire from margin (in the 

 specimen before me) about one-fifteenth the length of shell; sculpt- 

 ure consisting of very strong squarish spiral ribs, separated by wide 

 excavated interstices ; perforations 5 or 6 open. 



The right margin is quite convex, especially in the part of the lip 

 adjacent to the spire ; the back is convex ; it is not carinated at the 

 row of holes, but there is a shallow sulcus just below it. The color 

 is a reddish-brown, with irregular zigzagly radiating white flames. 

 The surface has very prominent unequal spiral ridges, often double, 

 or divided by a groove in the middle ; the number is variable, the 

 sj)ecimen before me having thirteen. The spire is near the margin, 

 not elevated, and something like that of H. iris in being few-whorled. 

 Inside silvery, with red, blue and green reflections, the nacre sulcated 

 spirally. Columellar ledge flattened, becoming gradually narrower 

 below, not at all truncated ; cavity of spire almost concealed by the 

 overhanging columellar plate, very small, scarcely spiral. Perfora- 

 tions 5 or 6, subcircular, their edges moderately prominent. 



Length 109, width 84, convexity 21 mill. 



Australia. 



