FISHES OF THE ROCKY MOUNTAIN REGION 16 3 
This is the only North American species; others occur in Central Asia. 
Dermal structures referred to Acipenser albertensis Lambe are found in the Judith Re 
and Laramie beds of Wyoming, etc. 
ORDER RHOMBOGANOIDEA (The Gar Pikes) 
Numerous species assigned to Lepidosteus have been described from the Cretaceous, 
and Wasatch and Bridger Eocene. L. aganus (Cope) and L. integer (Cope) are from New 
Mexico. L. atrox Leidy, L. cycliferus (Cope), L. glaber Marsh, L. notabilis Leidy, L 
occidentalis Leidy,t L. simplex Leidy and L. whitneyi Marsh are from Wyoming. The 
living L. osseus (L.) occurs in the Rio Grande. Other species live in different parts of 
North and Central America and one in China. 
OrDER CYCLOGANOIDEA (The Bowfins) 
The single living species (Amia calva L.) inhabits the eastern states, and comes as 
far west as Texas. Two (A. dictyocephala Cope and A. scutata Cope) are from the Mio- 
cene of Colorado. Six (A. depressa Marsh, A. elegans Leidy, A. gracilis Leidy, A. media 
Leidy, A. newberriana Marsh, and A. uintaensis Leidy) are from the Bridger Eocene of 
Wyoming. 
OrpDER NEMATOGNATHI (The Catfishes) 
Famity Siluride 
Rhineastes Cope, is a genus containing one species (R. pectinatus Cope) in the Floris- 
sant Miocene and five (R. arcuatus Cope, R. calvus Cope, R. peltatus Cope, R. radulus 
Cope, and R. smithii Cope) in the Bridger Eocene of Wyoming. 
The living species of the Rocky Mountains are as follows: 
Adipose fin keel-like, adnate to the back; length up to over a foot; color yellowish brown; 
fins yellow-edged; anal rays about 16 (Missouri R. in Montana; Wyoming; Platte R.) 
Noturus flavus Raf. (Stone Cat). 
Adipose fin with its posterior margin free . . cP AO RRNA SE Ry acs 
1. Anal fin very long, its rays 32 to 35 (Rio Gaandey! Ictalurus furcatus (Le Sueur). 
Piteasy fee neni Beye AEN OEMESS! (5) \// ERM eal 3 as iea bis vei ae. de gh) AN 
2) PULA AMS Re Gin neh Se: CEOS DIO fog Slo he Ameiurus lupus (Girard). 
Anal rays 25 to 30; light olivaceous above, the sides pale or silvery, and nearly always 
with small dark spots (Missouri R., Milk R., and Yellowstone R. in Montana, Hen. 
Shall; Platte ROS tava veahe deo Sy wn lk e's ew | w) Lebaherns punctatus (Rat.) 
(Channel Catfish). 
Six other forms of Ameiurus occur in Texas. Leptops olivaris (Raf.), the mud cat, 
occurs from the Ohio River to the Mexican State of Chihuahua. 
OrDER PLECTOSPONDYLI Sere aa 
Teeth well developed in both jaws (in our ie : . . . Characinide. 
Jaws toothless . . ; PRE LAT RRR VIP ge a 
1. Pharyngeal teeth numerous, pecans. ie fin with 10 or more rays 
Catostomide. 
Pharyngeal teeth few; dorsal fin (in ours) short with lessthan rorays . Cyprinide. 
t L. occidentalis and haydeni, of the Judith River beds, were based merely on scales, and are believed 
to belong to the same species. The supposed differences are: Scale not over 8 mm. long, the enameled sur- 
face smooth and shining, occidentalis (Leidy); Scale 1o mm. long, the enameled surface with ‘‘ parallel square 
lines,” haydent (Leidy). 
