. Transactions and proceedings of the New Zealand Institute . doubtful cases Ihave noticed that the head when kept for a week assumed the normal browncolour of the common trout, while the heads of such as I believed to be sea-trout retained their silvery hue. In the three species, S. salar, S. trutta, and , 1 do not believe anydependence can be placed on the numbers of fin rays, vertebrae, or evenpyloric caeca (excepting in the case of 8. levenensis), as a means of distin-guishing the one species from the other. Still these have their place andtheir value, and when any doubt arises as t
. Transactions and proceedings of the New Zealand Institute . doubtful cases Ihave noticed that the head when kept for a week assumed the normal browncolour of the common trout, while the heads of such as I believed to be sea-trout retained their silvery hue. In the three species, S. salar, S. trutta, and , 1 do not believe anydependence can be placed on the numbers of fin rays, vertebrae, or evenpyloric caeca (excepting in the case of 8. levenensis), as a means of distin-guishing the one species from the other. Still these have their place andtheir value, and when any doubt arises as to the identity of any particularSalmonoid, its removal should be the result of a careful consideration of allthe invariable distinguishing marks, together with that of such also as arenot invariable or not essential. I append a table, the investigation of which will bear out generally myobservations on the difierence in the size of the fins, as also on the ratio ofthe least depth of the tail to the whole length of the fish. ,l/OLI[ S. SaZ<cr S. ^riojc S. Vrrr/^a,
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