SUCKLEY MONOGRAPH OF THE GENUS SALMO. 113 



asli-gray; end of caudal pansy-purple'. Back, dorsal, and caudal stud- 

 ded witli sin;ill .scnii-lunar spots. A lar^je patch of arterial -red on tlu^. 

 operculum and margin of pre-opercnlum. Pectorals, veiitrals, and anal, 

 grayisU-wliite, tinged with rose red.'' 

 i Rays.— ''Br, 11; P. 12: V. 8: A. i;3: D. 11-0." The original speci- 

 nieus \xeiT obtained by Dr. Gairdner at the Cath]a})Ootl Piver, a small 

 I tributary to the Columbia. ISTonelmve be(m obtaiiunl during tlie recent 

 I explorations, although it is l)y no nu^.ans improbable that some one of 

 i the species lately described from healthy-run individuals may really be 

 , identical with this fish. For further remarks and suggestions concern- 

 ing iS.chirkii, see "J«rat. Hist. Washhigton Territory," or Pacilic li. R. 

 Eeports, vol. 32. 



15, SALMO IMMAOULATUS, Storer. 



THE UNSPOTTED SALMON. 

 Syx. — Sdlmo immdcnldlns, H. R. Stouer. Bo.st. Jouni. Nat. Hist., vi, pp. 204-20',). 

 [ Sp. Ch. — ( Drawn from Storer's original description.) Length of head 

 I about one-sixth that of the body; its dei)th two-thirds of its length. 

 I Jaws witfi numerous sharp incurved teeth. Eyes laterally elongated, 

 I their diameter one-third the distance between them. 0[)ercles rounded 

 ' posteriorly; below, naked and marked with concentric stria?. Pre-opercle 

 i larger than in S.fontin/iJis. 



[ Scales larger than those of S. fontinnliti. Lateral line commen(;es 

 I back of superior angle of the operculum, and assuming the curve of the 

 i body is lost at the commencement of the caudal rays. The first dorsal 



comnuMices just anterior to median line, and is nearly <|ua(lrangular. 

 ; Fuis. — Adipose at a distance back of the first dorsal little less than 

 [ one-half the length of the fish. Pectorals just beneath posterior angle 

 ' of the operculum ; their length three-fifths that of the head. Ventrals 

 Must beneiith postericn^ portion of first dorsal. The plates, at their base, 

 I very large; anal about the length of the head behind tin? ventrals, ter- 

 minating directly beneath the adipose fin. Caudal deei)ly forked, its 

 length equal to greater depth of body. 



Colors. — Silvery on sides and abdomen ; dvjrker on back. No spots. 



Diagnosis. — The diagnosis between this species, if it should I'eally 



prove distinct, would l)eb3' the following: Its silvery color; absence of 



I spots ; great length of head compared to the body, the strongly forked 



I tail and its great length. <' D. 9 : P. 13 : V. 9 : A. 11 : C. 30." ' 



[ The specimen described by Dr. Storer appeared to be unique. Its 



length was thirteen and a half inches, and from that circumstan(;e, and 



I from the deeply-forked tail, I am strongly inclined to consider it as that 



of a young fish, probably belonging to some species already" known — 



' perhaps 8. trutta. The naming of salmonidte, and the description of 



; new species, based upon the characters of young, partially developed 



fish, cannot be too strongly reprobated. There is already too much 



confusion in the syiuniymy of the various kinds ; and if the practice of 



S. Mis. 71 8 



