CONTENTS. 



Oen. 120. Myliobatis 



Sp. 246, M. aquila. Eagle Ray. PI. XXXII. 



Gen 121. Cephaloptera 



Sp. 247. C. giorna. Homed Ray 



TAGS 



335 

 335 



336 

 337 



XXX. FAMILY OP LAMPREYS. PETROMYZID^. 



■<3ren. 122. Pteromyzon .... 339 



Sp. 148. P. marinus. The Lamprey. PI. XXXIII. 339 



149. P. fluviatilis. River Lamprey , . 340 



150. P. Planeri. Planer's Lampem , ; 341 

 'Gen. 123. Ammoccetes .... 342 



Sp. 25 1 . A.hranckialis. The Pride, or Mud Lamprey. 



PI. XXXIII 342 



Gen. 124. Gastrobranchus . . . 343 



Sp. 252. a ccBcus. Myxine. PI. XXXIV. . 343 



Gen. 125. Amphioxus .... 344 



Sp. 253. A. lanceolatus. The Lancelot. PI. XXXIV. 344 



■SYNOPSIS .... 



Portrait of Humboldt, Frontispiece, 

 Vignette Title-page. 



347 



In all Thirty-six Plates in this Volume. 



