LIST OF PLATES. 415 



Plate LXXVII. 

 Fig. 242. The Large-scaled Sucker (Catostomus niacrolepidotus). 

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



Plate LXXVIIL 

 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 (Ammocoetes unicolor). 



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



