96 THE ELEMENTS 



Esq. in his supplement to Testacea 

 Britannica, that the animal inhabit- 

 ing the Teredo, is not a Terebella, but 

 an Ascidea. 



There are three species of this shell 

 described in Turton's Linne ; and one 

 has been found to inhabit the British 

 seas. 



Genus 36th.— SABELLA. Animal 

 a Nereis, with a ringent mouth, and 

 two thicker tentacula behind the head; 

 shell tubular, composed of particles 

 of sand, broken shells, and vegetable 

 substances, united to a membrane 

 by a glutinous cement. 



Habitation. The shells, (if they 

 can be called so) according to Linne 

 inhabit the sea and fresh water 

 ditches, &c. 



The shells of this genus cannot with 

 propriety be called testaceous, nor 

 are they crustaceous, but coverings 

 made up of extraneous substances ; 

 and may therefore fairly be expunged 



