CYPRINIDA. — XXVL 65 
gg. Sides bright silvery, without dusky shade. 
143. H. storerianus (Kirtland). Body rather elongate; back 
elevated; tail long. Head short, broad between eyes; eye equal 
to snout, three in head; preorbital broad, conspicuous, silvery ; 
snout abruptly decurved, its tip fleshy; lateral line decurved; fins 
high. Light olive, sides brightly silvery; fins all pale. Head 
41; depth 4. D, 8 A. 8. Scales 5-42-4, L. 4 to 8. Ohio 
to Neb. and Tenn., abundant in larger streams. (Ceratichthys 
lucens Jordan.) (To David Humphreys Storer, author of Fishes 
of Mass.) 
aa. Species of large size, little silvery, the mouth nearly terminal; D. slightly 
behind V. (Nocomis Girard.) 
144. H. kentuckiensis (Rafinesque). Horny HEAp. RIVER 
Cuus. JERKER. Robust; head large, broad above, the snout long, 
bluntish; mouth large, little oblique, the lower jaw shorter; eye 
small; suborbitals narrow; barbel evident; scales not crowded 
forwards, 18 before D. Bluish olive, with coppery shades; a dark 
bar behind opercle; fins pale orange, unspotted; young with a 
black spot at base C. Adult males in spring with a much swollen 
crest and large tubercles; a round crimson spot on each side of 
head. Head 4; depth 44. D.8. A 7. Scales 6-41-4. Teeth 
4-4 or 1,4-4,1. L. 10. Penn. to Dakota and Ala., very abundant 
in the rivers, rarely in small brooks; variable. (Ceratichthys bigut- 
tatus Kirtland.) 
61. COUESIUS Jordan. (To Dr. Elliott Coues.) 
a. Scales small, about 68 in the lateral line. 
145. C. plumbeus (Agassiz). Body rather elongate; head 
small; snout bluntish; mouth rather small, terminal; eye 4 in 
head; D. above V. Dusky, a plumbeous lateral band, fins plain. 
Head 5; depth 5. D.8 A. 7. Scales 11-68-7. L.6. Teeth 
usually 2, 4-4, 2. N. N. Y. (Mather) to L. Superior, chiefly in 
or near cold lakes. (Lat., leaden.) 
aa. Scales larger, about 60 in the lateral line. 
146. C. dissimilis (Girard). Body more robust, with lateral 
line more decurved. Mouth oblique, subterminal, resembling that 
of Semotilus. Dusky. Head 4}; depth 4}. Lat. 1.60. L.6. Minn. 
to Montana. 
62. PLATYGOBIO Gill. (mars, broad; Lat. gobio, gudgeon.) 
147. P. gracilis (Richardson). FLAT-HEADED CHuB. Body 
elongate; head short, small, very broad and depressed above, the 
interorbital area 2 in head; mouth large, oblique; eye small, 6 in 
head; fins large; 23 scales before D. Very pale, sides silvery, 
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