104 HALIOTIS. 



corresponding to the ribs of the outer surface. The outer surface is 

 closely and deeply furrowed by rough, prominent spiral ribs ; these 

 are closely scaly, and often between two thicker ones there is a 

 weaker lower riblet. A few folds in the direction of growth-striae 

 make the surface still rougher, and are also visible on the inside. 

 The color is a dirty yellowish-brown, flamed and marbled with red- 

 dish-brown, especially in young individuals. (Phil.) 



Length 80, breadth 43, convexity 16 mill, (ex icon.) 



Port Adelaide, and West coast of Australia. 



H. elegans KOCH in PHILIPPI, Abbild. u. Beschreib. i, p. 119, t. 

 1, f. 1, 2, 1844. REEVE, Conch. Icon., t. 7, f. 21. SOWEKBY, Thes. 

 Conch, v, t. 11, f. 82, t. 14, f. 119. WEINKAUFF, Conchyl. Cab., p. 

 51, t. 20, f. 2-4. 



An elegant species which I have not seen. The form is exception- 

 ally slender. There are about 8 holes open. 



Group of H. diver sicolor. 



These are oval shells, quite convex on the back and not so car- 

 inated at the row of holes as are the forms grouping around H. 

 pustulata, varia, etc. 



H. DIVERSICOLOR Reeve. PI. 15, fig. 80. 



Shell long, oval, the spire very near the margin, surface spirally 

 lirate ; colors reddish-brown, scarlet and green in irregular patches 

 and streaks ; holes usually 7 to 9. Inside silvery. 



The two sides are equally curved, and the back is quite convex. 

 Coloration very variable. Surface spirally lirate, the line unequal, 

 rounded, crossed by low folds indicating former positions of the per- 

 istome. There is no angle at the row of perforations, and the space 

 between perforations and columellar margin has unequal spiral 

 cords, not coarser than those of the rest of the disk. Inside silvery, 

 with light green and red reflections. Columellar plate rather nar- 

 row, flattened, sloping inward, not in the least truncate at base, so 

 wide above as to wholly conceal the cavity of the spire. Perfora- 

 tions oval, 7 to 10 in number. 



Length 63, width 41, convexity 12 mill. 



Length 86, width 57, convexity 19 mill. 



Australia (Reeve) ; China ; Nagasaki, Japan. 



H. diversicolor REEVE, Conch. Icon., f. 39, June, 1846. SOWERBY, 

 Thes. Conch, v, p. 27, f. 69. . 



