INTRODUCTION. 



rent's Body, but like Saplings from 

 the fame Root. I can however de- 

 termine nothing with any Certainty 

 upon this Head, tho* I have fince 

 had frequent Opportunities of examin- 

 ing them alive, having often found 

 them at their full Growth fingle, in 

 the Heat of Summer, at the Dhlance 

 of two or three Inches one from 

 another. 



Their Body, or rather the Cafe, 

 in which the Fiili is inclofed, is a 

 hollow Cylinder, not exceeding, when 

 dried by the Heat of the Sun, 

 as I found them, two Inches in 

 Length, extreamly compact, rough, 

 and black like Shagreen, tipped with 

 a Shell to Appearance bivalve, yet 

 really compounded of five different 

 Parts, and feems capable, while the 

 Animal is alive, of a confiderable 

 Extenfion, or Contraction. 



The Head of the Animal is in- 

 verted with many little Horns, or 

 Arms, gradually leffening in their 

 Length, which appear in the Micro- 

 fcope to be curioufly fringed, not 

 circularly difpofed round the Mouth, 

 B 4 but 



