[Footnote 4:  The parts referred to in the key may be defined as follows:  Anal fin, the single fin on the median line of the body, between the vent and the tail; gillrakers, bony protuberances on the concave side of the bones supporting the gills; branchiostegals, small bones supporting the lower margin of the gill cover; pyloric coeca, worm-like appendages of the lower end of the stomach; vomer, a bone in the front part of the roof of the mouth.]

I. Anal fin elongate, with 16 rays; gillrakers 9 + 14; branchiostegals
    15 to 19; pyloric coeca 140 to 180; caudal fin considerably
    forked; average weight about 20 pounds, maximum 100 pounds. 
    Quinnat salmon.

      [Illustration:  Chinook or quinnat salmon (Oncorhynchus
       tschawytscha)]

II.  Anal fin short, with 9 to 12 rays; gillrakers 8 + 12: 
    branchiostegals 11; pyloric coeca less than 70.

   1.  Teeth on vomer little developed, those on shaft few and
      deciduous; scales large, about 120 in lateral series;
      pyloric coeca 65; caudal fin emarginate; average weight
      15 pounds, maximum 40 pounds. 
      Atlantic salmon.

      [Illustration:  Atlantic salmon (Salmo salar)]

   2.  Teeth on vomer well developed, those on shaft of bone
      numerous and persistent in a zigzag row or two alternating
      series; scales about 150 (130 to 180) in lateral series;
      pyloric coeca 42; caudal fin squarely emarginate; average
      weight 10 pounds, maximum 20 pounds. 
      Steelhead trout.

      [Illustration:  Steelhead trout (Salmo gairdneri)]

      [Illustration:  Map showing the location of the salmon
      weirs and traps fished in Penobscot River and Bay in
      1896]

***End of the project gutenberg EBOOK the salmon fishery of Penobscot bay and river in 1895-96***

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