210 



rough, spinous, or tubereulated varices ; aperture 

 rounded or oval ; varices at least three, the lower 

 uniting obliquely with the upper in longitudinal 

 series ; a horny operculum. 



M. ERINACEUS. Lin. 1216. D. p. 690. Lam. 48. 

 Macgy. Aber. p. 168. Knorr. 4. t. 23. /. 3. 

 Born. t.ll. f. 3,4. Pen. 4. p. 123. t. 76. f. 95. 

 Don. t. 35. Mont. p. 259. Dor. Cat. t. 14. /. 7. 

 (Da Cos. t. 8. /. 7.) TRITON E. F.p. 356. Oval- 

 oblong; rough, strong, angulated, dirty white or brownish, 

 with seven or eight produced and contabulated whorls, 

 the apex pointed ; whorls with six or seven rugged pro- 

 minent varices, crossed by transverse elevated striae, the 

 whole shell (when not worn) imbricated by small 

 arched scales ; aperture oval, canal tubular, outer lip 

 thickened by a rib, inner edge dentated. If... 0,80. 

 Common. 



TRIBE. ALATA. 



With a longer or shorter canal at the base of the aper- 

 ture ; outer lip changing its form by age and sinua- 

 ted below. 



GENUS. ROSTELLAR1A. 



Fusiform or subturreted, terminating below in a beaked 

 canal ; outer lip dentated or entire, more or less 



