978 NERITA. 



Nerita intricata. Donovan, v. 1. 167. 

 Inhabits the coasts of England. Donovan, &;c. 

 Shells from half an hich to two inches long, and the length and 

 breadth are nearly equal ; the colours and markings are very 

 variable, and the above are only a few of the leading Va- 

 rieties of the twenty-five which Gmelin has enumerated; 

 iV. Stercm-muscarum has a similar form, and does not appear 

 to me to have a greater claim than the others to be consi- 

 dered a distinct species. 



CANCELLATA. 2. Shell witli decussated stiiaD and 

 impressed dots; spire somewhat club-shaped ; 

 umbilicus gibbous and bifid. 



Nerita cancellata. Herman Naturf. xvi. p. 55. t. 2. f. 8. 



and 9- Gmelin, p. 3670. Schreibers Conch, i. p. 319. 

 Nerita rugosa granosa. Chemnitz, v. p. 270. 1. 188. f. 1911 



to 1914. 

 Nerita, No. 14. Schroeter Einl. li. p. 309. 

 Nerita Canrena, Var. x. Gmelin, p. 3670. 

 Lister Conch, t. 5QQ. f. 16. 



Inhabits the coasts of the West India Islands. Chemnitz. 



Shell about three-quarters of an inch long, and equally broad, 

 of a whitish colour with obsolete spots, and sometimes with 

 a fulvous band and irregular rays. Chemnitz considered this 

 and the N. sulcata of Born to be the same species, but 

 Schroeter, Gmelin, and Schreibers, have placed them sepa- 

 rate. 



SULCATA. 3. Shell sub-globular, with oblique-lon- 

 gitudinal grooves, and the umbilicus bifid. 



Nerita sulcata. Born Mus. p. 400. 1. 17. f. 5 and 6. Gme- 

 lin, p. 3673. Schreibers Conch, i. p. 319- 



Nerita, No. 15. Schroeter Einl. ii. p. 309- 



Inhabits 



Born has described this shell to be eight lines long, and equally 



broad, and of a milk-white colour, with four obliquely 



grooved whirls. 



GLAUCINA. 4. Shell smooth, with a rather obtuse 

 spire ; umbilicus partly closed by the lip, 

 which is gibbous and of two colours. 



Nerita glaucina. Linnceus S;i/st. Nat. p. 1251. Pennant 

 ZooL iv. p. 140. t. 87. f. 141. Born Mus. p. 397- 



