4 



Outside with close radiating lines of bristly hairs ; base round, 

 smooth, creuated at the outer edge. The shell is quoted with doubt 

 by C. B. Adams, because of the difference in zoological province. 



Hab. Society Islands, Cuming ; Panama, C. B. Adams ; Mazatlan, 

 Brit. Mus. Coli. ; Atooi, Sandwich Islands, Nuttall. 



3 {b). HlPPONYX ? BARBATUS, Var. COSTELLATUS. H. t. "H. 



barbatse" simili ; sed eostis paucioribus, validioribus ; apice 

 subcentrali ; setis minoribus, temduribus, 

 Long. -5; lat. '42; alt. -27 poli. 

 Hab. 1 Ad iusulas Maris Caribbaei. 



This may prove a distinct species, but is only described from a 

 single specimen in my collcction, of which I can give no exact 

 authority for the locality. It has the esterior of H. Grayanus, with 

 the base of H. barbatus. 



A. HippoNYX (Amalthea) Grayanus, Menke, Zeit. f. Mal. 

 1853, p. 115. 



Hipponyx radiata, Gray, P. Z. S. 1835. C. B. Adams, Panama 

 Shells, p. 218, no. 329. Menke, Zeit. f. Mal. 1853, p. 79 ; non 

 H. radiata, Quoy & Gaimard, 1824 ; nec H. radiata, Desh. 1830, 

 {= H. crispa. Menke). 



Hab. Gallapagos, Cuming; Sandwich Islands, on Pinna, iV«<^^a/Z; 

 Panama, C. B. Adams ; S.W. Mexico, on Pinna, P. P. C. ; Mazatlan, 

 Brit. Mus. Coli. ; St. Vincent (W. Africa), Schmidt, teste Menke. 



Apex subcentral ; ribs fewer, coarser and more nodulous thau iu 

 H. barbata, with softer, smaller, fen'er, and more irregular hairs; 

 base flat, not very broad, rather rounded at the inner margin, cre- 

 nated at the outer, with numerous lamellae, undulated but not 

 serrated. 



^ 5. HippONYx SUBRUFUS, Lam. 



Pileopsis subrufa, Lam. An. s. Vert. vii. p. Cl 1, no. 4. 



Hipponyx subrufa, Sow. P. Z. S. 1835, p. 5. (Non P.milifaris, 

 Dilhv., ut ?credit Desh.) 



Capulus subru/us, D'Orb. Sagra Moli., ii. 186, pi. 24, f. 24, 25. 



Hipponyx , sp. ind., C. B. Adams, Panama Shells, p. 217, 



no. 326. 



Concholepas subrufa, H. & A. Adams, Gen. i. p. 373. 



Lamarck's shell was described from W. Indian specimens, Sowerby's 

 from Peruvian. There does not appear, however, any specific distinc- 

 tion between the two. Shell of a piukish red, with full, recurved 

 umbo, and finely cancellated surface ; base round, simple. 



Hab. W. Indies, passim ; Lobos Island, Peru, Cuming ; 1 Panama, 

 C. B. Adams. 



The figure oi H. subrufus, jun. in Sow. Thes. Conch. pi. 73. f. 21, 

 is much more likę the young of H. barbatus. 



6. HipPONYX TUBERCULATUS, n. S. H. t. soUdū, conica, sub- 

 rufa; apice subcentrali; eostis radiantibus creberrimis, con- 

 centrice tuberculosis, interstitiis minimis ; epidermide incon- 



