406 Mr. C. T. Regan oji the Systematic 



II. Piirietals meeting in the middle line. Teeth on vomer and tonj^-'ue, 

 when presi-nt, in several series. Scales larger, 13 or less in a 

 transverse series from origin of dorsal lin to lateral line. {Corcyj- 

 11 ma.) 



A. Dorsal fin .short, with not more than 16 rays ; teeth very smull 



or absent. 

 Teeth very small, but distinct, in bands in 



jaws and on palatines, in a patch on 



vomer and another on tongue 5. Stenodus, Richards. 



Teeth vestigial or absent 0. Cvreyowis, Linn. 



B. Dorsal fin longer, with not less than 18 rays ; teeth well developed. 



Mouth rather large ; teeth sl)ong 7. Phi/liKjejiln/ra, I'ouleng. 



^loulh rather small ; teeth moderate 8. T//i/7iu(/luf, Cuv. 



'Hie limits and contents of tlie four gcneia of the Salnio- 

 ninse are the subject of the following notes : — 



1. Salmo, Linn. 



This genus includes all the fishes commonly known as 

 Sahnon and Trout. Examination of tlie skeletons leaves no 



Viff. 1. 



.Sliulis of a. Allantic Trout (.S". tniit(i) and b. PMcitic Trout (.V. cltirfcii) 

 from iish aljout W inches long. 



(7A, me.'-X'thmoid ; tdh, lateral ethmoid; r, lon<i it udiinil ridge ; 

 /, supraorbital llaiige of frontal bone. 



doubt that the Pacific species (Stedhead, liainbow 'i'rout, 

 Quiniiat Salmon, (fee.) foiin a |)er[cetly natural group that 

 dillVrs in several cliaiacters Iroin tlie Salmon and Trout of 

 tlio Atlantic. The latter are especially distinguished by the 

 larLic size of the incjcthnioid lioncj which is not or but 



