HALIOTIS. 99 



H. PLAXATA Sowerby. PL 11, fig. 58 ; pi. 49, figs. 20, 21, 22. 



Shell oval, very flat, solid, spire not at all raised, distance of the 

 apex from the nearest margin about one-sixth the length of the shell. 

 Surface sculptured with numerous uneven spiral cords ; open per- 

 foration five. 



The outline is oval ; it is very much depressed, flatter than any 

 other species. Outside it is chocolate brown stained in places with 

 green, having oblique, branching streaks of cream-white, or blotches 

 of the same tint. The sculpture consists of numerous spiral cords 

 separated by deep grooves, the cords more or less nodose from the 

 intersection of uneven radiating folds, often obscure. Toward the 

 lower end, outside of the row of holes, the cords are obviously scaly 

 or granose. Spire plane, generally eroded and white. Inside 

 silvery, iridescent, spirally grooved. Columellar plate very wide 

 above, flat, not quite covering the small spire-cavity. Perforations 

 four to five, small, oval, their edges a trifle raised. 



Length 41, width 29, convexity 6 J mill. 



Philippines (Sowb.) ; Viti Islands (Garrett !), 



H.planata (CARPENTER, where?) SOWERBY, Thes. Conch, v, p. 

 30, fig. 74. 



This is the flattest species I have seen. The columellar ledge is 

 very wide and flat above ; the coloration is peculiar but variable in 

 pattern. I have been unable to find that Carpenter described such 

 a species. 



H. CRUENTA Reeve. PL 4, figs. 17, 18 ; pi. 49, figs. 24, 25, 26. 



Shell oval, depressed ; distance of apex from nearest margin one- 

 sixth to one-seventh the length of shell ; finely spirally striate ; holes 

 8, small, circular. 



The shell is about the size and shape of H. pustulata but is finely 

 striate spirally. The right side is straightened, the color is a rich 

 reddish-brown varigated with creamy markings. Surface spirally 

 marked with unequal striae, and having some wrinkles marking the 

 places of former peristomes. The spire is only a trifle raised. In- 

 side it is silvery and beautifully iridescent, nearly smooth. The col- 

 umellar plate is wide above, as in pustulata (see fig. 24, pi. 49). 

 Cavity of spire rather large. Holes numerous, small, circular. 



Length 46, width 29, convexity 9 mill. 



Habitat unknown. 



