) AND TH are: 

 ■I OTHl.R 



EM'I.OUATIONS LN WKSTKUN CANADA, l.TC. 121 



Tho fiimilii's Ml" tin- >rississjpi»i liiisin not y<-t t'oiiiiii in tin' Siiskiitrlu'wau l)iisiii 



1. I.i>!iisiislil(l:i'. •"'• Ali|l>lvii)>siil,f. !•. A(lliTilliil;i-. 



ll west sill '.'■ Aiiiii.la.'. '•• t'.vi.riiio.li.iiti.l;!'. in. Aplire.lo.lfii.lM'. 



,,<'atostn, ;V (•ln,,..i.lx. T. nn..n.i... 11. S,.,.n.n..l:... 



' , , . 4. l)()r..s..|iii.l:r. •'^ Alliruillhlir. 



'conu'tl 111 



Twenty two .sporinicns were tiikcu in tlic ( '(tlnnil>i;i. 'Plicy arc: 



.■Vniiiiooii'tfs triilciiiiitin. I'tycliochi'iliiM orfiiaiiriisis. .'^alvrliiiiis iiiMiia.vrnsli. 



Cut (Hi I II II us (II tost on Ills. l,»MiriHciis atiarins. < Iiicoi'IiviiiIiiih t sol i.iwvi sella. 



CaliiHtdiiiiis iiiai'r(>i'li('ilii>. I.i'iirisciis Iiyilrii|>lilii\. Ciililinliia traiisiiiniilaiia. 



'""*• l'aiilii.-<l('ii-< jdiilani. l.ciicisciix lialtcatiis lateralis. Cottiis asper. 



""• Aeroelieiliis aliitaeeii». Col-ejLronils willianisiuii. Cdtliis rlmtlieiis. 



'"'"• Ajfosia iiiiliila. Coreijoiiiis eniilleri. Cottils ]iliil(iiiips. 



"• A;rii>ia t'aleala. SmIimc iii\ kiss. , [.ota lota iiiaeiilos,!. 

 '""• Mvloelielllls enillllMlN. 

 e. 



p])elle 



Till' (('II .sjiccii's t;ik«'ii ill tin' I' rase ystt'in an-: 



Catd.stomiis inaeidclieiliis l.eiieisriis li:, IcmIiis. Salmo iiiykiss. 



iileiise liii-i' , .\u(isia I'aleata sliiisw ap. l,i>iieisiiis Ualteatiis lateralis < liieorliviK'liiis tseliawvlselin. 



.,>,i,ii_ Myloelieihis caiiriiiiis Coresioiiiis williaiiisoiii. Cot tils Msper. 



iinii'iis. l'tyeli(ielieiliisiin't;oiieiisis. 



But one variety. .[(/osIk /'nlctitu slnisir<i[}. was t'oiind in tlic i''ra.s»'r tliat was !■ )t 

 '"*•'• also ((iiukI ill (he ("oluinbia. [ Ltiicisoin Imltcatns has been taken by otliers in f.ie 



le Keil i;i\ Columbia system.) 



Several s|>eries of Oiicitrliifiirliu.i and Aciitnisi r an' known I'loni tlie roluniliia and 

 kie. from the Fraser whiili are not included in these iiuinbers. 



the Saskii! 

 then its In 



STRUCTURAL PECULIARITIES OF THE FRESH- WATRR FISHES OF THE 



PACIFIC SLOPE. 



Almost every fainily of tishes iiaxiii,!;' representatives in the fresh waters of b<yth 

 the Atlantic and tlu^ i'acifu" slopes has one or mine of its Pacilic slope representatives 

 nioditied in one or the other of two directions: There is either a laryer niiinber of 

 laiipell''- rays or spiiM's in one or m(»re of the tins, or some of the rays hav(^ become modilied 



n^'- into spines. The largest number of either thnsal or anal rays is almost always found 



rmiiueiis. ^^ sotiift Pacilicsloi»e sjM'cies, and the ran^(M)l' variation is always <^icater in the I'acilic 



slope species than in the .Vtlautic slope sp«'cies of the same family. altlioii;;h the num- 

 ber of species is usually less. In most cases the dilVereiices are Just percei)tiiile, and, 

 int. r oiitni! ^ereit not for tlie consensus of dillereiices in all <;ronps tliey would .stand for nttthinj;'. 



,' The most mai Ued dinerences are foand in those fishes wlii<li are "■enericallv distinct 



iiatleiisi' j:i i~' . 



)tiiutiilatii- from their Atlantic slope relatives. In sev«'ral ca.ses these moditicatioiis themselves, 

 ilosa. aside fro III all others, are of ji'eiieiic imiiortance, as in tlu^ jj^enera Arrhoplitrs, Mnhi, 



Lepidomt'ld, ('ulioiihia, ami the siibueuus h'irlianlsuniiis. 

 (•(■/('.s') arc 1 The modilications of the same set of orjjaiis beiiij;" practically of the .same iii'ture, 



sstmriaici are umpicstionably «lne to one dclinite cause. What that cau.se is 1 am at present 



unable to sa\. A comparatively sliort swift watercourse, as most of the I'acilic, 

 species, h;i\ rivers have. sufjj;;ests itself at once, but. as will be seen under the head of" Liical 

 'fore, can i -- 



The l'i-lii)iiiii:oiiliilii and Cfiilriiiiliiiln were not .seiureil l)y me, liiit .Mr. .V. .1. Woolniiiii toiiud 

 theM families in tlu' Inailw-iters ot' the h'eil Uiver system. 



pro. 

 trrnni 





9, 





