112 HALIOTIS. 



H. marice GRAY in Wood's Index Testaceologicus, suppl., t. 8, . 

 6. REEVE Conch. Icon., f. 11. SOWERBY, Thes. Conch, v, p. 19, 

 t. 6, f. 40, 41. WEINKAUFF, Conchyl. Cab., p. 53, t. 21, f. l.H. 

 dentata JONAS mss., teste Reeve. 



This seems to be an exceedingly variable form. Sowerby figures 

 a very different variety (see pi. 19, fig. 11), and says of it: " the 

 flatness of the early growth is very remarkable, and so is the transi- 

 tion of character to be seen in the after-growth." It is probable 

 that this form is the dentata of Jonas. A variety resembling this 

 last form is figured by Weinkauff. 



H. SQUAMOSA Gray. PI. 20, fig. 14. 



Shell oblong-ovate, transversely obliquely wrinkled, spirally 

 tubularly ribbed, tubercles scale-like, ribs sometimes close, sometimes 

 with a fine ridge running between them ; perforations rather large, 

 seven open ; exterior spotted and variegated with yellow and orange- 

 brown, interior whitish, iridescent. 



An extremely interesting species, well characterized by its close 

 ribs of scale-like tubercles, ranging across the shell in oblique waves ; 

 in the middle portion of the shell there is a fine ridge running 

 between the ribs ; the color is also peculiar, a kind of burnt-umber- 

 stained orange. (Reeve.} 



Australia. 



H. squamosa GRAY, Appendix to King's Survey of the Inter- 

 tropical and Western Coasts of Australia ii, p. 494, 1827. REEVE, 

 Conch. Icon., t. 7, f. 20. H. quamosa Gray (typog. err.),WEiNKAUFF 

 Conchyl. Cab., p. 22, t. 3, f. 2. H. bistriata var. /?, GMELIN. ? H. 

 Roedinyi Chemn., MENKE, Zeitschr. f. Mai. 1844, p. 97. 



Group of H. midce. 



Characteristic of the South African zoological province. Spiral 

 sculpture is scarcely visible on these shells, but radiating folds or 

 lamellae are prominently developed. Young shells have a blood-red 

 spot within the cavity of the spire. 



H. MIDJS Linne. PL 8, figs. 43, 44. 



Shell large, rounded-oval, moderately convex ; distance of apex 

 from margin about equaling one-fifth the greatest length of shell ; 

 body-whorl strongly angled at the position of the perforations, per- 

 pendicularly descending from the angle to the columellar margin, 



