PURPURA.— Plate III. 



Species 14. (Mus. Cuming.) 



Purpura planospira. Purp. testa, orbiculari-ovatd, 

 spird plano-depressd ; transversim squamicostatd, costis 

 mbdktantibus, interstitiis obtnso-liratls, colnmelld medio 

 profunde excavatd, labri margine sulcata ; extiis pallidi 

 rubido-fuscd, columella albd, maadd oblongd nigra medio 

 notald, infra rugis rufis conspiciie tinctd, aperturm 

 fauce albicante, riifo-Uneatd, lineis margitiem versus 

 saturatioribus. 



The flat-spire Purpura. Shell orbicularly ovate, spire 

 flatly depressed ; transversely scale-ribbed, ribs rather 

 distant, interstices obtusely ridged, columella deeply 

 excavated in the middle, edge of the Up grooved ; ex- 

 terior pale reddish-brown, columella white, marked 

 in the centre with an oblong black spot, conspicuously 

 stained beneath with red wrinkles, interior of the 

 aperture whitish, lineated with red, lines deeper red 

 towards the margin. 



Lamarck, Anim. sans vert. (Deshayes edit.) v. x. p. 71. 

 Purpura lineaia, Enc. Meth. 



Hub. James Island, GaUapagos (on exposed rocks); 

 Cuming. 



Several specimens of this remarkable shell were collected 

 by Mr. Cuming at the island above noted ; and he never 

 met with it in the course of his researches at any other 

 locality. 



Species 15. (Mus. Cuming.) 



Purpura aperta. Purp. testd orbiculari-ovatd, basem ver- 

 sus subattenuatd, transversim tuberculatd, tuberculis 

 squamtp/ormibus, prominentibus, in seriebus subdistan- 

 tibits, interstitiis subtiliter lirati.s ; columelld coucavo- 

 planatd, rugis perpaucis brevibus notatd, labro sulcata, 

 intus tenuidenticulato ; albicante, punctis castaneis 

 obscure tinctd, columelld et apertura fatwe albii, colu- 

 mellfB rugarum interstitiis labrique sulcis pallide rubido- 

 luteis. 



The open Purpura. Shell orbicularly ovate, a little 

 attenuated towards the base, transversely tuberculated, 

 tubercles, scale-like, prominent, in rather distant rows, 

 the interstices between which are finely ridged ; colu- 

 mella concavely flattened, marked with a very few 

 short ^vrinkles, lip grooved, finely denticidated within ; 

 whitish, iusterstices between the wrinkles of the 

 columella, and grooves of the lip, palely stained with 

 reddish yeUow. 



De Blainville, Nouv. Ann. du mus. 

 Purpura macrostoma (?), Conrad. 



Had. San Carlos, Central America. 



A very characteristic and well-defined species, which 

 does not appear to have been known to Lamarck. The 

 shell described and figured by M. Kiener as a variety, is 

 merely the same thing in a bad state of preservation. 



