v ADVERTISEMENT. 



to clothe it in an English dress, an attempt in which I trust my 

 labors may not be wholly without success. 



The insertion at the end of each Class, of a List of the prin- 

 cipal works that treat of its anatomy, instead of in the form 

 of foot-notes, may be regarded as a somewhat novel feature in 

 a scientific work in this country ; it is highly important, how- 

 ever, that we should become acquainted with the literature of 

 a subject in order duly to appreciate its value and progress 

 up to the present time ; and I have therefore hoped, by giving 

 it a prominent position in the book, to call the attention of 

 the reader more directly to this most useful department of his 

 studies. 



ALFRED TULK. 



London, 1845. 



