142 



PROCEEDINGS OP THE ACADEMY OP 



|_1883. 



length of muzzle, and in interorbital width. Head four times in 

 length without caudal fin ; depth at ventral fin, five times in the 

 same. Dorsal fin originating behind line of last ventral ray ; 

 radii always I. 9. Caudal peduncle rather deep. 



Measurements. m. 



Total length (with caudal fin), . . . . -lOI 



Length to edge of operculum, .... '010 



Length to first ventral ray (outside), . . . '044 



Length to first dorsal ray (outside), . . . "047 



Length to first anal ray (outside), . . . •060 



Length to base of caudal fin, .... -085 



Depth at occipital region, . . . , . "OlS 



Depth at first dorsal ray, . . . . . '018 



Depth at first anal ray, . ... . . . 'OIG 



Depth of caudal peduncle, '009 



Color silver}-, dusted with smoky, to below the lateral line, and 

 marked on the sides and back with several rows of dusky spots. 

 Bases of inferior fins and upper lip red. 



This species differs from the species of Apocope, which it 

 generally resembles, in having a perfect lateral line. It agrees 

 with the A. henshavi in having nine dorsal rays, but has a longer 

 muzzle and larger scales. The latter has the following scale 

 formula, 16-6*7-12. It is possible that some of the specimens 

 referred by Jordan to the A. henshavi belong here. Abundant in 

 Weber River at Echo, Utah, 



CLIOLA Gird. 

 Hyho}38iii "Agass." Cope and others. 

 Cliola angustarca Cope. Proceeds. Amer. Philo?. Society, 1877, p. 230. 



Well distinguished from the allied fossil species by its narrower 

 pharyngeal bones, and its teeth 4-4. Fossil Lake, Oregon. 



MYLOLETJCUS Cope. 



Annual Report U. S. Geol. Survey Terrs., 1871, p. 475. Jordan, Synopsis Fishes 

 North America, 1883, p. 887. 



This genus differs from Leucus Heck, in its dental formula, 5-4 

 instead of 5-5. It is characteristic of the streams and lakes of the 

 Great Basin, and of those waters of Oregon and California which 

 lie nearest to them. Most of the lakes of southwestern Oregon 

 contain them, and their variations are such as to render their 



