HALIOTIS. 97 



diagnosis of a larger one (fig. 22). " Shell complanate, subovate, 

 wide behind, somewhat narrower in front, milk-white variegated with 

 red and green ; spirally lirate, the lira? distant, elevated, undulately 

 nodose, interstices irregular, narrow ; holes a little prominent, small ; 

 apex almost immersed. The sculpture is somewhat finer, but quite 

 as irregular as in H. varia. The flatness and breadth of the spire 

 and comparative attenuation of the anterior give a different .appear- 

 ance to the shell. The prevalence of bright scarlet in the markings 

 is noticeable." 



This species is considered by Weinkauff a synonym of If. uni- 

 lateralis Lam. 



H. UNILATERALIS (Lam.) Weinkauff. PI. 17, figs. 97, 98. 



Shell egg-shaped or long oval, depressed-convex, rough, encircled 

 by spiral lira, which above are beset with low tubercles ; variegated 

 or marbled with orange, red and white, and strewn with little brown 

 flecks and a few larger ones. Spire distinct and rather lateral in 

 position, little elevated, with numerous scarcely elevated perforation- 

 tubercles, of which five remain open. They are more nearly circular 

 than oval. Inside scarcely furrowed, having silvery nacre giving 

 very faint reflections of red. Cavity of the spire visible and sur- 

 rounded by a riblet. Columellar plate curved, pretty wide, espe- 

 cially above, margined outside, produced inward, emarginate below. 

 Lip short, thin and blunt, scarcely crenulated. ( Weinkauff.) 



Timor and Australia (Lam.) ; Philippines ( Owning) ; Mascarene 

 Is. (Robillard) ; Massana, in the Red Sea (Jickeli) ; Suez (M' Andrew). 



H. unilateralis LAM. Anim. s. Vert., vi, p. 217. WEINKAUFF, 

 Conchyl. Cab., p. 55, t, 21, f. 4. 5. 



I have given Weinkauff 's description and figures of this species. 

 I have not seen specimens. Weinkauff considers H. concinna Rve. 

 a synonym. 



H. PAPULATA Keeve. PI. 3, fig. 6. 



Shell somewhat orbicularly ovate, spirally obtusely ridged, ridges 

 rather distant, conspicuously tuberculated ; perforations a little 

 tubiferous, four open ; dark coral-red, variegated here and there 

 with patches of yellow. 

 7 



