736 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



(1) the salmon, (2) the sea-trout, (3) the common river-trout of Europe, 

 and (4) the Allice shad. These, in accordance with the nomenclature 

 generally prevalent, are (1) Salmo salar, (2) Salmo trutta, (3) Salmo fario, 

 and (4) Alausa vulgaris. The old genus Salmo has been differentiated 

 by Siebold into two genera : (1) Salmo, including the charrs and hucho, 

 distinguished by the vomer being abbreviated, the anterior short portion 

 thereof alone armed with teeth, the hinder louger portion (shaft) being 

 wholly toothless in the old as well as in the young; and (2) Trutta, 

 including the salmon, sea-trout, river-trout, and related species, whose 

 vomer is elongated, (the anterior short portion being with or without 

 teeth.) and the hinder elongated portion (shaft) armed along its entire 

 length with teeth, which, however, in the very old are more or less lost. 

 These would respectively correspond to (1) Salvelinus Bon. emend. 

 (= Salmo Siebold) and (2) Salmo Linn. Bon. emend. (= Trutta Siebold). 

 The " Maifische" of the Germans is the common shad or Allice shad of 

 the English, (Alosa vulgaris,) and is very closely related to the sbad of 

 the American coast (Alosa sapidissima). 



THEO. GILL. 



