160 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY - IV. 



Kaf. Irhili. Oh. .">-' : Hyborhynchv* i>('rxjii<-niiK Grd. Proc. Acad. Nat. Sri. Phila. 

 l~."itl. \-~>: Ili/tiiii/iiiitliiix j>< rxpicnux Giinthcr, vii, 185.) 



of month \vilh a iniiiut.', thickish liarln-1. 



t '.it II. Bapercf liosns Cope. 



I lead broader, more ridged above. Caudal and anal fins more dusky ; 

 otherwise like I!M- laM, I'roiu which it may be distinguished only by the 

 presence of the small barbel. With the last, equally widely distrib- 

 uted, and even more abundant. Probably a variety. 



i ,.|i.-. Join 11. Arutl. Nat. Sci. Pbila. 1868, 234; .Ionian, 289.) 



81. EXOGL.OSSUUI Kalincsque. 

 Cut-lips. 



(nafiiic<i|iic. -Tourn. Acad. Nat. Sci. Phila. i, 420, 1818: type Exoyloxsum Imutmrianiim 

 Kat'. --t'lijirniitx nuij-illiiujiia Lc S.) 



]>ody moderately elongate, little compressed. Mouth peculiar, the 

 mandible being contracted and incurved, its outline strongly three- 

 lobed. This a})})earance is due to the fact that the dentary bones lie close 

 together, parallel, and are united throughout their length, instead of 

 forming a broad arch, as in all other Cyprinoid lishes. The lower lip is 

 represented by a broad lleshy lobe on each side of the mandible. l"p- 

 perjaw not protractile. Upper lip thick, somewhat plicate. IMiaryn- 

 geal bom-s small. The teeth hooked, without grinding surface, 1, -11,1. 

 Scales moderate. Lateral line complete, l-'ins without s])ines. Dorsal 

 slightly behind ventrals. Anal rays 7-8. Isthmus broad. (Jill-rakers 

 weak. Pseudobi-anchia- present. Air-bladder normal. Alimentary 

 canal short ; peritoneum white. Size moderate. One of the most 

 strongly marked genera of Ci/in'ini<l(C, with a single species, (i'^w, out- 

 side; Y'-''"''^"-) tongue.) 

 1D.S. E. maxilling'aa. (Le Suenr) Haldcman. CHI-HIIH: SI/>IK -/<>!. 



I5ody rather slont, little compressed. Head large, broad and llattish 



above, with tumid cheeks. Mouth moderate, slightly oblique, the end 



of the maxillary not reaching the line of the orbit. Upper ja\v longer 

 than lower. Scales rather crowded anteriorly, those in front of the 

 dorsal sjnall. ( 'olor olivaceous; smoky or dark above ; a blackish bar 

 behind opeicle, and a dusky shade at the root of the caudal in the 

 young; fins unmarked, Head I; depth 41. I>. s ; .\.7: scales s-."i;;-5; 



teeth 1. 1-1, 1. L. (! inches. YYeslerii New York to Virginia: abun- 

 dant in the Su-i|iiehanna I'.asin, but not widely distributed. Oneofthe 

 most singular of the ('///;/////</<(, distinguished al si-lit by its three- 

 lobed lower jaw. 



1 yprinut iiiiu-illiiiiiiin l.i- Sumr. .loiirn. Acad. Nat. Sci. Phila. i, 85; Giiulhcr, vii, 

 188; Jordan, 308j <'{. Cyi-r. IVim. iHitl, I5GO.) 



