314 Distribution of the Salmonide. 
genus. No specimens longer than twelve inches are known, and 
hese are mature. They were obtained in Victoria Lake, North 
latitude 82° 34’, and in fresh-water pools of Floeberg Beach (82° 
28’). This species is the most northern salmonoid known. 
Before leaving this subject it may not be amiss to recall the fact 
that the origin of the Salmonide is obscure. No fossils of true 
Salmonide are known, except one genus, which is based upon the 
cranial bones only. This genus, Rhabdofario of Cope, is from 
Lake Idaho, a late tertiary lake in Eastern Oregon and Western and 
Southern Idaho. The following account of the Rhabdofario lacus- 
tris is from Professor Cope’s paper in Proceedings American Philo- 
sophical Society, 1870 :— 
“ A species with a head as large as that of the Salmo salar. The 
genus is nearly allied to Salmo. With no other portions of the 
animal than the cranial bones, the only difference I discover is in 
the form of the maxillary bones, which are sub-cylindric or rod- 
like, instead of flat or laminiform, as in Salmo. At the extremity, 
though flat, they are still narrow; and I do not find surface of 
attachment for the supernumerary bone of Salmo. Teeth on the 
maxillary and mandibular arches large, numerous; teeth on the 
vomer, glossohyal, and palatine bones also well developed. Muzzle 
and mandible smbegual, Maxillary . . bearing reduced teeth 
near its extremity.” 
The pertinence of Rhabdofario to the Salmonide is, perhaps, open 
to doubt, on account of the shape of the maxilla and the probable 
absence of a supplemental bone. i 
