PLATE CLXXIII. 



TURBO MAMMILLATUS. 



MAMMILLAIED TURBO. 

 GENERIC CHARACTER. 



Animal Limax : shell univalve, spiral, or of a taper form. Aper- 

 ture somewhat compressed, orbicular, entire. 



SPECIFIC CHARACTER. 



Shell imperforate, subovate, whorls striated with raised dots, and 

 slightly angulated by a few of the strise, the dots of which are larger. 



Turbo mammillatus : testa imperforata subovata anfractibus 

 striatis punctis eminentibus striis aliquot majori- 

 bus subangulatus. 



This remarkable shell is introduced among the British species of 

 the Turbo genus, only on the authority of a posthumous memoran- 

 dum in the hand writing of Da Costa, which we find in the 

 collection of that Conchologist affixed to one of the specimens 

 figured in the annexed Plate. From this it appears the shell had 

 been picked up by Mr. Piatt on the Scilly rocks, at the western 

 extremity of Cornwall, and communicated by him to Da Costa, 



vol. Y. h 



