LIST OF PLATES. 415 
Puate LXXVII. 
Fig. 242. The Large-scaled Sucker (Catostomus macrolepiotus). 
243. The Long-finned Chubsucker (Labeo cyprinus). 
Puate LXXVIII. 
Fig. 244. The compressed Burbot (Lota compressa). 
245. Dorsal view of the same. 
246. The Hedgehog Ray, male, (Raia erinaceus). 
a. Dorsal view. 6. Abdominal. 
Prats LXXIX. 
Fig. 247. Bluish Sea Lamprey (Petromyzon nigricans). 
248. Colored Mud Lamprey (Ammoceetes bicolor). 
249. Variegated Lamprey (Petromyzon lamottenii). 
250. Plain Mud Lamprey (Ammoceetes unicolor). 
a. Nostril. b. Under side of the mouth. 
