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 Dunedin, N. Zealand; Chatham and Auckland Is.; S. 



A ustralia. 



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. Xat., p. 3689. H. ruber LEACH, Zool. 

 Misc. i, p. 54, t. 23, teste DILLWYX. 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. maria\ 



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 

 specimen 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, 



