[ 3 



Order in which they are now depofited 

 under their feveral Titles : a fmall De- 

 fcription of each Kind, and the Names 

 of a few of the rnofl remarkable Shells, 

 will be fufficient to anfwer our prefent 

 Purpofe. 



One of the large Tables contains a 

 Part of the Univalves, or Shells confiil- 

 ing of one Piece or Part. 



Echwi Marini. Thefe are fometimes 

 called Centroniae and Cidarcs. The Sea 

 Hedgehog, or Urchin, the Sea Egg, or 

 the Sea Cake, are the Names of the dif- 

 ferent Kinds of it in Englijli, Moft of 

 them are of a globular Figure, fometimes 

 with, at other times without. Spines, be- 

 fet with a great Number of regularly 

 ranged Tubercles, and with Apertures 

 more or lefs in Number, as far as fix or 

 feven. Many of them are of a flat de- 

 preffed Figure, when they are called Pla- 

 centae, or Sea Cakes, and they are not 

 iinfrequently inchned to an oval Form, 

 when they bear the Name of Sea Eggs. 



When 



