408 Systematic Arrangement of the Family Salmonidae. 



2. Salyelinus, Nilss. 

 The species of Char may be ananged as follows: — 



1. S. alpinus group. — Head of vomer with posterior process 



but little developed. Basi-branchial teeth uniserial. 

 'sso dark spots or markings. Circurapolar. 



2. S.fontinalis group. Head of vomer with a well-developed 



posterior process. Basi-branchial teeth absent. 

 BlMckish or dark olivaceous ?])0ts or markings on 

 back, dorsal, and caudal fins. N. America. 



3. S. namoycush group. — Head of vomer with a long poste- 



rior process. Basi-branchial teeth in a long patch. 

 N. America. 



>!»•' 





Diagrams showing- the arrangement of the vomerine teeth iu 

 a. iSalvelinus periaii, b. tS. fotitinalis, c. 6'. 7Uin>ai/cush, 



S.fontinalis is so exactly intermediate between the typical 

 Char and S. namoycush in the form and dentition of the 

 vomer that I think it best to give up the genus Cristivomer, 

 Gill & Jordan. 



3. HUCIIO, Giinth. 



This genus includes three species : — 11. hucho, Linn,, from 

 the Danube ; 77. iaimen, Palh, from Siberia, and //. I'crryi^ 

 Brev., from Saghalien and Yesso. 



4. Brachymystax, Giinth. 

 Closely related to llucho. A single species from Siberia. 



