ADDENDA. 313 



Obs. Acipenser maculosus and A. oxyrhynchus of Le Sueur, Am. Phil. Trans., An. 1818, 

 differ from A. Rupertianus in their abdominal shields being acutely keeled and spinous. 

 A. maculosus has a broader snout than the latter. Acipenser transmontanus is represented 

 one-third of the natural size in Plate 97, f. 2. The shields full size, a. dorsal, b. lateral, 

 c. ventral. 



Page 291, to follow Spinax acanthias. 



[133.] 1. Squaltjs (Scymnus) Gunneri. The Northern Scymnus. 



Family, Selachii. Genus, Squalus. Sub-genus, Scymnus. Cuvier. 

 Squalus Caicharias. Fabricius, Faun. Grasnl., p. 127. 

 Eekalloorksoak. Greenlanders. 



This species, which we omitted to quote from Fabricius in its proper place, 

 rivals the White Shark in size, and is greatly dreaded in the Greenland seas. It 

 is reported to have occasionally destroyed the native fisherman by biting off his 

 lower extremities, together with the bottom of the skin-covered kayack in which 

 he was seated. — The scymni have spiracles, but are destitute of the anal fin and 

 dorsal spines. The second dorsal is over the ventrals. 



Page 295. Cottus asper. 



Plate 95, f. 1, two-thirds natural size. 



1 neglected to mention in the description of this species, that it differs from its 

 congeners in having teeth on the palate-bones, being in that respect like Hemi- 

 lepidotus, to which genus it will probably be hereafter referred. It wants the scales 

 however of the latter, and its dermal spines are peculiar. A side view of the fish, 

 a front of the head, and the roof of the mouth, are represented on the plate. 



2 s 



