136 HIPPONYX. 



H. AUSTRALIS, Quoy. PI. 41, figs. 9-15. 



Rather thin, with broad flat radiating ribs and narrow inter- 

 stices, concentric sculpture rather faint or obsolete, apex erect, 

 subposterior ; whitish, or the interstices of the ribs sometimes 

 orange-brown, interior usually stained with orange-brown. 



Length, 22 mill. 



Australia, New Guinea, N. Zealand, Mauritius, 



Viii Is., Japan. 



II. acutnz, Quoy (figs. 12, 13), H. suturalis, Quoy (figs. 14, 15), 

 H., cornucopias, Hutton, H. orientalis, Dufo, are synonyms. It 

 is possibly AmaUhea conica, Sch'um. a name which would 

 have priority if its identity could be fully established ; another 

 older name which possibly belongs to this species is Patella 

 cassida, Dillw. 



H. IMBRICATUS, Gould. PI. 41, figs. 16, 17. 



Apex subcentral, surface rayed with forty to fifty ribs, which 

 are trellised by concentric growth-lines, yellowish white, chestnut- 

 color stains the interior. Length, 12 mill. 



Sandwich Islands. 

 H. CRYSTALLINUS, Gould. PI. 41, figs. 18, 19. 



White, ctiystalline, apex marginal, recurved, radiately ribbed, 

 ribs somewhat undulated by the growth-lines, aperture margin 

 thick behind, thin anteriorly. Length, 12 mill. Nab. unknown. 



Described as a Capulus. 



H. GRANULATUS, A. Adams. PL 41, figs. 20, 32. 



Shell Capuliform, with compressed sides and posterior, declined 

 apex; reddish brown, with white granules disposed in radiating 

 series, and subflexuous concentric lines, reddish brown within. 



Length, 16 mill. 



West Coast of Africa. 



Was found attached to the spine of a Cidaris, and reproduces 

 its granulations ; probably on a larger smooth surface the species 

 would be very different in form and ornamentation. 



H. DANIELT, Crosse. PI. 41, figs. 21, 22. 



Apex posterior, sharp; carmine, rest of surface brownish, radi- 

 ately striate, interior chestnut-colored, more or less varied with 

 carmine towards the apex. Length, 22 mill. 



New Caledonia. 



