12 INTRODUCTION. 



» 

 lately doubted ; and because the Sepia has shewn 



the power of leaving, though not of returning, at 



pleasure to its receptacle, it has been considered a 



mere parasite. Till the right owner shall have been 



discovered, or it shall have been proved that the 



tenant uniformly found in possession could not be 



the builder, we may be pardoned for adhering to 



the old prejudice. 



Before we proceed to the systematic arrangement 

 and explanation of the Genera, it will be necessary 

 to acquire some knowledge of Terminology, as 

 without this their technical descriptions will be un- 

 intelligible. 



The terms expressive of the forms and characters 

 of the Univalves are placed first in the following 

 Catalogue, in conformity with the order adopted by 

 the author of the " Fundamenta Testaceologiai " 

 in the " Amcenitatcs Academical " of Linnaeus, 

 from whence most of them arc derived. 



