40 Cincimmti Sociity of Natural History. 



Family Salmon idixi. 

 (The Salmon.) 



Osmerus mordax, Gill. Common Smelt. 2187. 



(^sinerus thaleichthys, Ayres. 2188. 



Salmo irideus, Gibbons. California IJrook Trout ; Rainbow 

 'I'rout. 2185. 



The genu.s Salmo is a variable one. No dependence can be 

 placed on any of the characters. The young are known as "parr ' 

 and differ in many ways from the adult. The adult males are 

 mere intensly colored than the females. The water has a 

 marked influence on the colors. "Trout with intense ocellated 

 spots are generally found in clear rapid rivers, and in alpine pools; 

 in the large lakes with pebbly bottom the fish are bright silvery 

 and the ocellated spots are mixed with or replaced by X shaped 

 black ^spots; in dark holes, or lakes with peaty bottom, they often 

 assume an almost uniform blackish coloration." (Gunther). The 

 species interbreed and cross and in the size, the fins and scales 

 they vary greatly. 



Salmo purpuratus, Pallas. Oregon Brook trout; Salmon trout. 

 2184. 



A very variable species. The probable ancestor of a nun)l)er 



of reputed species. 



Salvelinus fontinalis, G. and J. Speckled or Brook trout. 

 2226. 



Thaleichthys pacificus, G. and D. Candle Fish : Eulachon. 

 2 186. 



A very fat fish. An oil has been prepared from them similar 



to cod liver oil. The common name of "Candle Fish" is given 

 from the fact that if set on fire at one end they burn like a torch 

 till consumed. The oil is highly prized I)y the Indians of ■ the 

 north west coast. Large quantities of the lish are caught in nets ; 

 they lie in heaps on the ground for five or six days, and are then 

 boiled. The atmosphere is charged at that time with odors far from 

 agreeable. 



Tliymallus tricolor, Cope. Grayling. 2227. 



Family Percopsidie. 

 Percopsis guttatus, Agass. Trout perch. 2189. 

 The only genus and species of the family. 



Order 7. Haplomi. 



Family Cyprinodontido:. 

 Cyprinodon yariegatus. Lac. Sheep's head. 2192. 



