754 MUREX. 



Shell about an inch and a quarter long, aud four lines and a 

 halt" broad ; the lo\^'er whirls are of a whitish colour, and 

 the upper ones brown, or tinged with violet, except the lon- 

 gitudinal plaits, which are whitish ; the three lower whii Is 

 have a thick rounded belt at the sutures, and the whole sur- 

 face is finely striated transversely ; the aperture has a small 

 canal at the upper as well as the lower extremity. 



RADULA. 52. Shell turreted, with four or five 

 transverse tuberculated ribs, of which the 

 uppermost but one has the tubercles larger 

 than the others. 



Murex fluviatilis, Gmelin, p. 3o62. 



Murex, No. 52. Schroeter Einl. i. p. 562. 



Nerita aculeata. MuUer Verm. ii. p. 193. 



Cerithium Radula. Bruguiere Enc. Meth. p. 491. 



Le Popel. Adanson Senegal, p. 152. t. 10. f. 1. 



Lister Conch, t. 122. f. 20. Martini Berl. Mag. iv. 1. 11. 



f. 58. 

 Junior. With the aperture imperfect. 



Murex Radula. LinncEus Syst. Nat. p. 1226. Born 



Mils. p. 324. t. II. f. ]6. Schroeter Einl. i. p. 539. 



t. S. f. 6. ? Gmelin, p. S5QS. 

 Murex Terebella, Gmelin, p. 3562. Schreihers Conch, i. 



p. 206. 

 Murex Sinensis. Var. y. Gmelin, p. 3542. 

 Murex, No. 39, and No. 60. Schroeter Einl. i. p. 557, 



and p. 562. 

 Lister Conch, t. 122. f. 18. Gualter, i. 58. f. F. Klein 



Ost. t. 2. f. 40. Martini Berlin. Mag. iv. t. 10. f. 57, 



and Conch, iv. t. 155. f. 1459. 

 Inhabits the African Seas. Linnaus. Muddy rivers of Sene- 

 gal, within reach of the tide. Adanson. 

 Shell about three inches long and one-third as broad ; it dif- 

 fers from M.fuscatus in having the transverse tuberculated 

 ribs more numerous, and the spines on the uppermost rib 

 but one, though larger than the others, are comparatively 

 small ; it has sixteen whirls, of which it is difficult to distin- 

 guish the separating line, and the base is flattish, though not 

 so much so as in M.fuscatus ; it is white or pale flesh- 

 colour, covered with a brown epidermis, and Bruguiere says 

 that young shells sometimes have a white band at the su- 

 tures ; Born also mentions a Variety with red and brown 

 transverse stripes. 



