136 HIPPONYX. 



H. AUSTRALTS, Quo^^ PL 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 usuallj^ stained with orange-brown. 



Length, 22 mill. 



Australia^ New Guinea, N. Zealand, Mauritius^ 



Viti Is., Japan. 



H. acutus, Quoy (figs. 12, 13), H. sidu7'alis, Quoy (figs. 14, 15), 

 H. cornucopise, Hutton, H. orientalis, Dufo, are S3'nonyms. It 

 is possibly Amalthea conica, Schum. — a name which would 

 have priority if its identity could be fully established ; another 

 older name which possibl}' belongs to this species is Patella 

 cassida, Dillw. 



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



Apex subceutral, surface ra3^ed with forty to fifty ribs, which 

 are trellised b}' concentric growth-lines, yellowish white, chestnut- 

 color stains the interior. Length, 12 mill. 



Sandwich Islands. 

 H. CRYSTALLiNUS, Gould. PL 41, figs. 18, 19. 



White, ctrystalline, apex marginal, recurved, radiately ribbed, 

 ribs somewhat undulated by the growth-lines, aperture margin 

 thick behind, thin anteriorly. Length, 12 mill. JIab. vnkr\o\rn. 



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 niilL 



West Coast of Africa, 



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



its granulations ; probably on a larger smooth surface tlie species 



would be ver}' difierent in form and ornamentation. 



H. Danieli, Crosse. PL 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. 



Neio Caledonia. 



