GILL] NOTEWORTHY EXTRA-EUROPEAN CYPRINIDS SLs 
(lineatus) of the species. Otherwise, as Jordan and Evermann add, 
‘ 
the species “ varies greatly with age and surroundings.” It grows 
Fic. 66.—Chub of Utah Lake, Leuciscus lineatus. After Gill. 
to a length of a foot or more—at least to fifteen inches occasionally. 
According to Jordan (1884) it “is excessively abundant in Utah 
Lake and, as it ascends the streams to spawn almost simultaneously 
with the trout (Salmo mykiss clarki?), it is extremely destructive 
to the young of the latter. It is taken in considerable number in 
seines, and is sold in the markets of Salt Lake City and other towns. 
Rather nearly related to the chubs and daces is a genus whose head- 
quarters are in the Gila river and from this it has derived its name 
(Gila). The physiognomy of the fishes is characteristic, the caudal 
peduncle being exceptionally slender and elongate; the caudal fin 
is deeply forked and enlarged by rudimentary or fulcrum-like rays 
which increase its extent above and below the-peduncle; the scales 
Fic. 67.—Gila elegans. After Girard. 
are very small and barely imbricated; the head is broad and the 
snout prominent; otherwise it is essentially like the chubs and has 
pharyngeal teeth of the same general type as the Tigomas (2, 5— 
2) 
ney, 
