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fpiral Turns of the Shell are in Part co- 

 vered by the laft Volution. 



Nerit^e^ are a Kind of femicircular 

 mouthed (femiiunaris) Cochlea, often 

 dentated ; fome have exerted Apices, 

 others deprefied, and many of them are 

 umbilicated : they generally inhabit Ca- 

 verns on the Sides of Rocks, where the 

 Fifh ftick faft to the Stone. Of the Spe- 

 cimens fome are fafciated, others reticu- 

 lated, and in Colour various, as white, 

 green, black, and yellow : Among them 

 are many that are called Bead Shells, and 

 others tea Shells. 



2" rochi^ Top Shells, fo called from fome 

 fmall Refemblance they bear to a Boy's 

 Top. The are a Kind of Cochlea, fome- 

 what approaching to the Form of a 

 Cone, but the Summit fometimes m.ore 

 deprelTed, and they are not unfrequently 

 dentated the Infide of the Shell is of. a 

 moft beautiful Mother of Pearl Colour j 

 many are rough, others fmooth, fafciated, 

 or wavy of all which there are Speci- 

 mens, 



