Ixii INTRODUCTION. 



with reference, on the one hand, to the characters which 

 are given of the different genera and species, in the body 

 of the work, and, on the other, to their habits and mode 

 of hfe. For those who seek for further information, I 

 beg to refer to the excellent digest contained in Pro- 

 fessor Rymer Jones's " Outline of the Animal Kingdom," 

 to Professor Owen's admirable lectures on the Inver- 

 tebrata, to Dr. Milne Edwards's article Crustacea in 

 Dr. Todd's " Cyclopaedia of Anatomy and Physiology," and 

 above all, to the great general work of the same author 

 on the natural history of this class of animals.* In the 

 introductory portion of that invaluable book, and in the 

 general description of the different groups contained in 

 the body of the work, will be found an immense fund of 

 information, great part of which is original and based 

 upon the actual dissection and observation of that distin- 

 guished naturalist, and of his no less talented friend and 

 coadjutor, Mons. Audouin, My obligations to this nn- 

 rivalled monograph will appear in every page of this little 

 work, and demand my warmest acknowledgments. 



* Histoire Naturelle des Crustaces, torn. iii. Paris, 1834. 



