118 HALIOTIS. 



blue reflections. Columellar plate narrow, obliquely truncated at 

 its base. Perforations a little raised, numerous. 



Length 75, width 58, convexity 23 mill. 



West Coast of Australia. 



H. Roei GRAY, King's Voy., vol. ii, appendix, p. 493. REEVE, 

 Conch. Icon., t. 4, f. 10. SOWB., Thes. Conch, v, f. 77, 78. WEIN- 

 KAUFF, Conchyl. Cab., p. 37, t. 15, f. 4-6. H. scabricosta, MENKE, 

 Moll. Nov. Holl. Spec., p. 31. PHILIPPI, Abbild. u. Beschreib. i, p. 

 120, t. 1, f. 6.H. Hargravesi Cox, Proc. Zool. Soc. Lond. 1869, p. 

 49, t. 26, f. 4. 



The orbicular form, and knotted spiral cords separated by deep 

 grooves are characteristic. The columella is rather narrower than 

 usual. 



The specimen before me is half-grown, like the figures on pi. 48, 

 representing the H. scabricosta. H. Hargravesi is a still younger 

 shell. 



H. SULCOSA Philippi. PI. 48, figs. 17, 18, 19. 



Shell suborbicular, rather depressed, reddish ; having about 30 

 equamose ribs above ; spire moderately large, a little prominent ; 

 perforations very small. Inside white, pearly, scarcely sulcated. 



The thirty riblets between the suture and the holes, as well as the 

 six riblets between holes and columellar margin are made almost 

 scaly by close elevated growth-lines. They are much more num- 

 erous and less raised than in H. scabricosta. The color of the back 

 is reddish-brown, tending toward gray. The inside is not furrowed 

 as in other species, and has a silvery-white nacre with a few brown 

 spots. The holes are much smaller than in H. scabricosta, and it is 

 more convex. (Phil.) 



Australia. 



H. sulcosa PHIL. Zeitschr. f. Mai. 1845, p. 150; Abbild. u. Bes- 

 chreib. ii, p. 157, t. 6, f. 2a, b, c. 



H. COCCORADIATA Reeve. PI. 4, figs. 16, 20. 



Shell oval, depressed, distance of apex from margin about one- 

 sixth the length of shell ; spirally striate, decussated by closer, finer 

 growth-striae ; perforations 6 ; color yellowish or olive, with irregular 

 radiating stripes of vivid scarlet. 



The shell is rather small, right margin decidedly less convex than 

 the left ; upper surface depressed, flattened, and having a spiral de- 

 pression around the middle of the body-whorl ; rather thin ; radiately 



