One of the two fish families the book names, and it is not the general one: 1-188 sets it against Coregonidæ as a geographical pair — "the mouth of the Anadyr is the last place to the north to which large shoals of Salmonidæ resort every year to spawn … On the Arctic shore, Coregonidæ begin to be abundant from Chaun Bay." Pacific and Arctic, two sentences, two families.

Coregonus is deliberately not here, though 1-190 names it two clauses later: that sentence runs "on the Pacific … Salmonidæ …; on the Arctic, for catching various species of Coregonus", which is 1-188's split again, so the Coregonus half is the contrast to Salmonidæ and not an instance of it. Modern taxonomy puts Coregonus inside Salmonidae as a subfamily, and reading it in here on that ground would be filing the book under a classification it does not use — its own name for the group is printed, once, and this entry follows the print.

Thymallus vulgaris hangs from Pisces for a weaker version of the same reason. 1-192 reads "for catching grayling, also various kinds of trout and other fresh-water species of Salmonidæ", where other may govern the trout alone or the grayling too. One ambiguous clause is not enough to place a genus.