Cl.VI. SABELLA. CONCRETE-SHELL. 373 



breadth three eighths of an inch. Animal un- 

 known. 



Inhabits deep waters.* 



* The editor perfectly coincides in the opinion entertained by 

 the authors of the Testacea Britannica, and recently adopted by 

 Mr. Montagu, " of the impropriety of classing these heteroge- 

 neous tribes with the testacea;" but as no other place has been 

 assigned them in the system, he has left the genus Salella where 

 it was placed by Linnceus and Mr. Pennant. Ed. 



