891 



181. Cerithium radula (pi. clxxxvi. f. 303), Linnaeus, 

 Syst. Nat. no. 575. Non C. radula, Born. 0. Owenii, Ferr., 

 Martini Conch, t. 155. f. 1459. Murex granulatus. Wood, Ind. 

 pi. 28. f. 160. Murex terebella, GmeL, no. 144. 



Cerith. testa elongato-turrita, epidermide fusco-viridescente in- 

 duta, granoso-nodulifera ; anfractibus numerosis, superne angu- 

 liferis, ad suturam granulatis, ad angulum angulatim pliciferis, 

 sub angulo duplicatim moniliferis ; apertura subquadrata ; labio 

 externo antice producto. 



We have some doubt in separating this from the preceding ; 

 some specimens occur which seem to indicate a tendency to as- 

 sume the same characters. In its normal form however this 

 species does not present the prominent aculeations of C.fuscatum. 

 West Africa. 



182. Cerithium multigranum (pi. clxxxvi. f. 302), Nobis. 

 C. radula, Born, non Linn. 



Cerith. testa elongata, fusca vel grisea, costellis spiralibus re- 

 gulariter rotundatim granosis cincta; anfractibus superne angu- 

 latis, ad angulum et ad suturam moniliferis ; apertura oblonga ; 

 labio externo antice producto ; columella subtortua ; canali si- 

 nuato. 



Eesembling C. radula, but with the rows of granules rounded, 

 regular, and nearly equal. West Africa. 



183. Cerithium fluviatile (pi. clxxxvi. f. 296 to 299), 

 Potiez et Michaud, Cat. des Moll, de Douai, p. 363. pi. 31. f. 19, 

 20; Kiener, pi. 19. f. 3. Strombus pictus, Bolten,fid. March. 

 Far. Cerithium alatum, Pkilippi, t. 1. f. 11. Far. C. microp- 

 terum, Kiener, Sp. Gen. Coq. pi. 30. f. 3. C. radix, Dufo. 



Cerith. testa pyramidali, solida, fasciata, plerumque epidermide 

 induta, longitudinaliter plicata; anfractibus numerosis, distinctis, 

 rectiusculis, medio bisulcatis; sutura excavata; ultimo anfractu 

 latere univaricoso ; apertura subangulata ; labio externo plus mi- 

 nusve expanso, a?tate angulatim elevato ; columella tortua. 



Through all the varieties of this shell it preserves the same 

 general characters ; the incised grooves, the straight ribs, the deep 

 suture, and the expanded outer lip ; and although the latter character 

 varies so much in degree as to have caused some authors to sepa- 

 rate the broadly expanded variety from that which is but slightly 

 so, we consider these variations such as are frequently found in 

 different ages and conditions among lluviatile shells. Indian 

 Seas. 



