460 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



toids may be divided into two series, on the presence or absence of this 



slit, as follows: 



Without slit. 



Ascelichtliys. 



Psychrolutes.* 



Cottunculus. 



Uranidea. 



Cottopsis (including Tauridea and 



Potamocottus). 

 Cottus. t 

 Artedius. 

 Hemitripterus. 



With slit. 

 Blepsias. 

 Nautichthys. 

 Blennicottus. 

 Oligocottus. 

 Leptocottus. 

 Scorpsenichthys. 

 Liocottus. 



Triglopsis (including Oncocottus). 

 Gymnacanthus. 

 Aspicottus. 

 Icelus. 

 Triglops. 

 Heinilepidotus. 

 Melletes. 



2. Coregonus w^illiamsoni Grd. — Mountain Herring. 

 Very abundant. 



3. Salmo purpuratus Pallas. — Lake Trout; Brook Trout. 



(Salmo clarki Rich.) 



Very abundant in Utah Lake ; a food-fish of much value. 



Specimens obtained do not difier in any visible respect from others 

 taken in salt water in Puget Sound. This is apparently the parent 

 stock from which 8. spilurus, S. irideus, and >S^. gairdneri Rich., {S. trun- 

 catus Suckley) have scarcely yet become completely differentiated. S. 

 henshawi Gill & Jor. is a marked local variety of 8. purpuratus. 



4. Sqiialius taenia (Cope) J. & G. — Leather-side Minnow. 



Very abundant. We find it impossible to separate the genera 8quaUus, 

 TelesteSj Tigoma, Siboma, Cheonda, and Clinostonius, and we adopt for the 

 whole group the name of 8qualius. The genus Dohula was established 

 by Rafiuesque in the Ichthyologia Ohiensis (1820, p. 45). Although no 

 type is stated, it was probably based on the Cyprinus dohula L., after- 

 wards the type of 8quaUus Bonaparte. 



5. Squalius montanus (Cope) J. «&> G. 



Also abundant. 



6. Squalius cruoreus, sp. nov. 



Allied to 8quaUus ardesiacuft Cope, but with larger scales and shorter 

 head. 



* We are unable to perceive any distinction between the Psychrolutidce and the Cot- 

 iidce. Psychrolutes has a rudimentary spinous dorsal, hidden in the loose skin. 



tin Cottus granJandicus, polyacanthocephahts, and scorpius a small pore is present be- 

 hind the last gill. In other species {octodecimspinosus ceneus, scorpioides), the slit appears 

 to be wholly obliterated. In a specimen of C. polyacanthocephalus of about two feet iu 

 length there is visible a minute pore representing the usual last slit. 



