176 UNIVERSITY OF COLORADO STUDIES 
OrDER HEMIBRANCHII 
FAMILY Gasterosteide (The Sticklebacks) 
The Brook Stickleback, Eucalia inconstans (Kirtland), is reported by Henshall from 
Poplar R., Montana. It has 4 or § dorsal spines. 
OrpER ACANTHOPTERI (The Spiny-Rayed Fishes) 
Famity Aphredoderide (The Pirate Perches) 
Dorsal fin single, with few small spines. Vent anterior, its position varying with age, 
from just behind the ventral fins in the young, to below the preopercle in the adult. One 
genus and species among living fishes, confined to the eastern United States. The group 
is so distinct that Jordan and Evermann place it in a distinct suborder, Xenarchi. 
‘No less than four genera of these fishes have been described by Cope from the Rocky 
Mountain Tertiaries. Jordan and Evermann remark that these fossil genera “‘seem to 
stand between A phredoderus and Elassoma, which seem to be near relatives on the one 
hand, as Percopsis is on the other.” 
The fossils are: 
Trichophanes foliarum Cope, and T. copei, Osborn, Scott and Speir, Miocene shales 
of Florissant, Colorado. 
Amphiplaga brachyptera Cope, Asineops pauciradiatus Cope, A. sqguamijrons Cope, 
Erismatopterus endlichii Cope, E. levatus Cope, and E. rickseckeri Cope, all from the Green 
River beds of Wyoming. 
Famity Mugilide (The Mullets) 
Two short dorsal fins, well separated, the anterior with four stiff spines, of which the 
last is much the shortest. 
Pelecorapis berycinus Cope, is from the Pierre Cretaceous of Montana. 
Syllemus latijrons Cope, is from the Benton Cretaceous, doubtfully of New Mexico. 
Famity Centrarchide (The Sunfishes) 
Body more or less shortened and compressed. Dorsal fins confluent. 
Jordan and Evermann say: “fresh-water fishes of North America; genera 12; species 
about 30, forming one of the most characteristic features of our fish fauna.” They appear 
to be very few in the vicinity of the Rocky Mountains, however. 
Dorsal fin scarcely longer than anal; silvery olive, mottled with clear olive green (Boulder 
County, introduced: Juday). . . . . . . . Pomoxis sparoides (Lacép.) 
(Calico Bass). 
Dorsal fin much larger thanthe anal . . is 
1. Body comparatively elongate, the depth . adult shout Gace the jenett dorsal 
fin low, deeply emarginate, with 1ospines. . . a Wycaeenes 
Body comparatively short and deep; dorsal fin not decay eciaigtante 3. 
2. Mouth moderate; young more or less barred or spotted, never with a black lateral 
band (introduced in Montana) . . . . . . . Micropterus dolomieu Lacép. 
(Smal]l-mouthed Black Bass). 
Mouth large; young with a blackish lateral band (introduced in Boulder Co., Colo., 
and Montana). . .. .. . . . . « « Micropterus salmoides Lacép. 
(Large-mouthed Black Bass). 
