4/0 



tlief^ are rarely fecn in full grown fliells on the body 

 vhirl, but in young fpecimens, which are ufually white, 

 thefe markings are extremely elegant, but vary in fliape 

 and colour: volutions fix, the firft very large and ventri- 

 cofe, the others fmali in proportion, rounded, produced, 

 and placed fomewhat lateral : apex \evy fliarp pointed: 

 aperture fub oval, fub-lunated; outer lip rather thin, 

 even; pillar lip thick, reflexed, forming a large and 

 deep umbilicus; mouth clofed by a corneous operculum. 

 Length an inch and a half; breadth fomewhat lefs. 



This fpecies feems principally to inhabit the deep, as 

 it is thrown up in vaft abundance on many parts of our 

 open fliores ; is common on moft of our fandy coafts, 

 but no where more plentiful than on thofe of South 

 Wales, and DcvovJ]iire* 



4. 

 Fluviatilis. Nerita fluviatilis. Li?i. Syft. p. 1253. — Gmcl. Syjl. p, 3676. 



Chem. Couch, ix. t 124. f. 1088. ' 

 Br. Zool. t. 87. f. 1 42.— Gz/rt//. t. 4. L. L. 

 Lijicr Conch, t. 607. f. 43. & t. 1 41 . f. 38. 

 Id. Angl t. .2. f 20.— Turt- Lin. iv. p. 549. 

 Schroet.FlujJconch. t.5.f.5. tolO. — & t.Min. 

 C. f. ?>.—Miin Verm. ii. p. 194. No. 381. 

 Da Co/Zrt. p. 48. t. 3. f. 8. 

 Favan. t. 61. D. 3. 4. 17. 20. 

 Pult. Cat. Dorfet. p. 50. 

 Hill. Swavnnerd. p. 83. t. 10. f. 2. 

 Don. Br. Shell. i.t,\6.{. 2. 



Nerita 



