CONTENTS. 



PAG1 



Gen. 120. MYLIOBATIS . . . .335 



Sp. 246, M. etquifa Eagie Ray. PL XXXII. . 3?5 



Gen 121. CEPHALOPTERA .... 

 Sp. 247. C. giorna. Horned Ray 



XXX. FAMILY OF LAMPREYS. PETROMYZID^. 

 Gen. 122. PTEROMYZON . . . .339 



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



149. P.fluviatilis. River Lamprey . . 340 



150. P. Planeri. Planer's Lampern . s 341 

 Gen. 123. AMMOCCETES .... 342 



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



PI. XXXIII ..... 342 

 Gen. 124. GASTROBRANCHUS . . .343 



Sp. 252. Q. CCBCUS. Myxine. PL XXXIV. 

 Gen. 125. AMPHIOXUS .... 344 



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



SYNOPSIS ...... 347 



HUMBOLDT 



V'srnette Title-page . 



In all Thirty-six Plates m &,* 



