236 



Field and Forest Rambles. 



between it and the other two are in the formation of the 

 labials (a)> where the crest (c) projects beyond the limb of 

 the bone, the latter being not quite three times the length of 

 the intermaxillary (b). This peculiarity (if persistent) is cer- 

 tainly very characteristic of the namaycush. The ventral fin 



HEAD OF THE NAMAYCUSH. 



is placed further back than in the togue and siscowet, and the 

 tail is more forked. There is a double row of teeth, extending at 

 least half an inch backwards on the vomer. The teeth, gums, 

 and roof of the mouth have a tinge of purple, hence Mit- 

 chell's name, " Amethystine Salmon." 



THE SISCOWET. 



The siscowet is known by this native name apparently in con- 

 tradistinction to the last, which is also found in Lake Superior. 

 The former appears to be very plentiful about Isle Royal. 

 Agassiz makes out the following distinctive characters ; but as 

 many are also common to the other two, I merely indicate the 

 discrepancies. The lower branch of the pre-operculum (a) 

 is more extended than the upper (b). The pectoral fin (c) is 



