2. 



46s 



teral, fometimes quite flat; others are fomewhat^produc- 

 ed, but the feparating line is very fmall, and fcarce dif- 

 cernable at the apex : aperture fub-orbicular, fub-lunaied, 

 fometimes inclining to oval; margin thickened within, 

 the edge (harp. It is not fo flat at the pillar lip as ufual 

 in fliells of this genus, but fpreads a little at that part. 

 Length three-quarters of an inch; breadth not quite 

 fo much. 



This fpecies is extremely common on all our fliores : 

 is fubjett to great variety, both as to colour and fliape, 

 which feems to have occafioned fome confufiorf, as 

 there is little doubt but the Nerita littoratis and Turbo 

 neritoides of Li n n .£ u s are only varieties of the fame flieli. 



Nerita pallidulus. Ba Cojia. p. 51. t. 4. f. 4. 5. 



Don. Br. Shells, i. t. 16. f. 1. 1. 

 Nerita pallidula. Turt. Lin iv. p. 54S. 



N. with a fub-pellucid, liglu-brovvn fliell, with three 

 volutions, the firft extremely large, the others very 

 fmall, and placed lateral, fcarcely produced, but well 

 defined; is when alive covered with a rough brown epi- 

 dermis, beneath which the fljell is nearly fmooth, or 

 faintly wrinkled; aperture femi-lunated ; outer lip thin, 

 fringed by the epidermis; pillar lip thick, white, con- 

 cave, and umbilicated; infide gloffy. Length near half 

 an inch ; breadth three-eighths. 



Da Costa was the firU writer who defcribed this 



fpecies. 



