[ ] 

 When the Fifh that inhabits this Shell is 

 alive, it is generally armed with a great 

 Number of Spines, or Prongs, which are 

 moveable at the .Animal's Pleafure, by 

 means of Mufcles that communicate with 

 the Spines through the Papillns of the 

 Shell. The Animal ufes thefe Spines 

 both for its Defence, and inilead of Legs 

 to enable it to move from Place to Place. 

 When the Fifh dies, thefe Spines are ve- 

 ry apt to fall off, which difcovers the Pa- 

 pillae to which they were joined, and a 

 great Number of regularly difpofed Ex- 

 crefcences on the outward Surface of the 

 Shell, wherever there was a Spine, one 

 .may perceive the Shell perforated. 



Among the Specimens of the Echini 

 ^re the round Sea Eggs, with beautiful 

 Ranges of Tubercles •, the rounded fiat- 

 ^ ti(h Sea Eggs, with large Papillae, each 

 tfet round with fmall Tubercles j the oval, 

 :fiat, radiated, and undulated Sea Eggs, 

 without Spines many flat Placentae, or 

 ' Sea Cakes \ fome few of the Specimens 

 G 6 yet 



