xii PREFACE. 



from the works or memoirs of Gosse, Mubius, Verrill, Pour- 

 tales, L. Agassiz, a. Agassiz, Smitt, Edwards and Haime, 

 Wilkes and Hartt. In addition, the volume is indebted for 

 a few cuts to the beautifidly ilhistrated popular works, " Le 

 Monde du Mer " and '" La Vie et les Moeurs des Animaux ; " 

 but nearly half of these were engraved from m.y plates. Tlie 

 sources of all the figures are given in the List of Illustrations. 



James D. Dana. 

 New Haven, Conn., Feb, 12, 1872. 



