CUT-LIPS. 841 
Hab'ts—This species swarms in all the streams in the State of Ohio, 
ascending small and even muddy brooks. It is a species of feeble organ- 
ization and without bright colors. Old males in the spring are rather 
curious-looking little fishes. 
GrENus 30. EXOGLOSSUM. Rafinesque. ‘ 
Exoglossum, RAFINKSQUE, Journ. Acad. Nat. Sci., Phila., i, 1818, p. 420. 
Type, Exoglossum lesueurianum, Raf. — Cyprinus maxillingua, LeS. 
Body moderately elongate, little compressed ; dentary bones nearly straight, connected 
throughout their length ; mandible much contracted, incurved, witha fleshy lobe on each 
side of it at the base, the middle thus resembling a projecting tongue; teeth hooked, 
without grinding surface, 1, 4-4, 1; no barbels; premaxillaries not projectile ; air-blad- 
der normal ; alimentary canal not elongate; scales moderate; dorsal line present; fins 
without spines; dorsal slightly behind ventral ; anal basis short. 
A single species known, singularly distinguished from allthe other Cyprinoid fishes 
by the structure of the lower jaw. 
61. HWxoGLossUM MAXILLILINGUA (LeSueur) Haldeman. 
Cut-lips; Day Chub; Nigger Chnb. 
Cyprinus maxillingua, LESUEUR, Jour. Acad. Nat. Sci. Phila., i, 1817, 85. 
Exoglossum maxillingua, HALDEMAN, Rupp. Hist. Lancaster Co., 1844, 474.—AGassiz, Am. 
Journ. Sci. Arts, xix, 1855, 215;—Copkr, Trans. Am. Philos. Soc. 1866, 360.—GUNTHER, 
Cat. Fishes, Brit. Mus., vii, 188.—JORDAN, Man. Vert,, 2d Ed., 308, and of other 
writers generally. 
Exoglossum lesueurianum, RAFINESQUE, Journ. Acad. Nat. Sci. Phila., i, 1818, 420. 
Description —Body rather stout, little compressed ; head large, broad and flatish above, 
with tumid cheeks; mouth moderate, slightly oblique, the end of the maxillary not 
reaching the line of the orbit; upper jaw longer than lower; scales rather crowded an- 
teriorly, those in front of the dorsal small; color olivaceous, smoky or dark above; a 
blackish bar behind opercle, and a dusky shade at the root of the caudal in the young ; 
fins unmarked; head 4}; depth 5; D. 8; A. 7; lat. 1. 53; teeth 1-4-4-1. Length six 
inches. 
Habitat, Western New York to West Virginia. 
Diagnosis.—This is the only minnow in America in which the two 
dentary bones or forks of the lower jaw are united in one for their whole 
length. 
Habits.—This singular fish has not yet been recorded from Ohio. As, 
however, it is very abundant in the Susquehanna River, and its occur- 
rence in the Kanawha River has been noticed, it will probably be found 
in the eastern part of the State. Its habits resemble those of Compostoma 
anomalum, preferring clear rock-pools, but not haunting rapids. Accord- 
ing to Professor Cope, “its stomach usually contains abundant remains 
of Physx, Pisidia, and other small mollusca, which form its food. The 
