LIST OF PLATES. 415 



Plate LXXVII. 

 Pig. 242. The Large-scaled Sucker (Catostomus macrolepidotus). 

 243. The Long-finned Chubsucker (Labeo cyprinus). 



Plate LXXVIII. 

 Fig. 244. The compressed Burbot (Lota compressa). 



245. Dorsal view of the same. 



246. The Hedgehog Ray, male, (Raia erinaceus). 



a. Dorsal view. b. Abdominal. 



Plate LXXIX. 



Fig. 247. Bluish Sea Lamprey (Petromyzon nigricans). 



248. Colored Mud Lamprey (Ammoccetes bicolor). 



249. Variegated Lamprey (Petromyzon lamottenii). 



250. Plain Mud Lamprey (Ammoccetes unicolor). 



a. Nostril. b. Under side of the mouth. 



