HALIOTIS. 79 



spiral sulci, and very minutely wrinkled. Columellar plate rather 

 wide, sloping inward, flattened, obliquely truncated at the base. 

 Cavity of spire large, rather shallow. Perforations unusually small, 

 their borders not raised outside. 



Australia. 



H. albicans QUOY ET GAIMARD, Voy. de P Astrolabe iii, p. 311, 

 t. 68, f. 1, 2. DESK, in LAM., An. s. Vert, ix, p. 31. KEEVE 

 Conch. Icon., f. 30. PHILIPPI, Abbild. u. Beschreib. ii, t. 4, f. la, 

 lb. SOWERBY, Thes. Conch, v, t. 3, f. 20. WEIXKAUFF, Conchyl. 

 Cab., p. 71, t. 28, f. 2. H. glabra^ SWAINSON, Appendix to Bligh 

 Catal., p. 1, 1822. 



Distinct in its smooth rounded form and radiating stripes. All 

 previous monographers have given New Zealand as the habitat of 

 this shell, but Hutton drops the species from his New Zealand list 

 of 1880. 



Group of H. cracherodii. ^ ^ 



v 



This smooth black species is probably * divergent branch of the 

 group of H. corrugata. 



H. CRACHERODII Leach. PI. 10, figs. 52, 53. 



Shell oval, convex, spire near the margin ; surface almost smooth, 

 but usually showing nearly obsolete spiral lira. Perforations about 

 8, color greenish-black or dull purplish-black. 



An oval shell with the two sides equally curved, the back regularly 

 convex, not carinated at the row of perforations ; outside covered 

 with a thick black layer. Surface smooth, except for spiral lirse 

 which are sometimes wholly obsolete, and lines of growth. Spire 

 low, near the margin. Inside smooth, silvery with red and green 

 reflections ; columellar plate not truncate below, sloping inward, its 

 face concave ; cavity of spire very small, almost concealed. 



Length (of an average specimen) 112, width 85, convexity 30 

 mill. 



Fallarones Is. to San Diego, Cal. 



H. cracherodii LEACH, Zool. Misc., p. 131. REEVE, Conch. Icon., 

 f. 23. CARPENTER, Report, p. 390. WEINKAUFF Conchyl. Cab., 

 p. 12, N t. 5, f. 1, 2. H. glabra SCHUB. & WAGX. Continuation 

 Conch. Cab. xii, p. 76, f. 3036, 3037 (not glabra Chem.). H. cali- 

 forniensis SWAINS., Zool. Illust. ii, t. 80. REEVE, Conch. Icon., t. 8. 

 f. 26. CARPENTER, Rep., p. 199, 320. 



