31. CYPRINID.E LEUCUS. 245 



a promiiieut raised prominence of the bone. Scales moderate. Lateral 

 line continuous, decurved. Anal basis short. Abdomen not comjiressed. 

 Intestinal caiial not elongate. Species numerous in Europe, Asia, and 

 America. This genus is very closely allied to the European Leuciscus 

 Cuvier, diU'ering in the presence of teeth 5-5 or 5-4, instead of G-5 or 

 G-0. The name finally to be adopted for this group, if admitted as dis- 

 tinct, is uncertain. (A;yz»;-, white.) 



«. Tet'th 4-1,* witli entire edges. (Algansea GiravdA) ' 



407. JL. tiiicclla (Vul.) J. & G. 



Body stoutish. Head heavy. Mouth moderate, oblique, the maxil- 

 lary not reaching to the eye. Jaws about equal. Eye rather small. 

 Caudal peduncle thick. Fins small, the caudal short. Dorsal just over 

 ventrals. Scales quite small, firmly attached and not closely imbricated, 

 HH in Mylochilus, etc. Coloration dark, plain; fins unspotted. HeadSf; 

 depth 3f ; scales 17-70-9; teeth 4-4. L. 6 inches. City of Mexico. 



(Leuviscus tinceUu C. & V. xvii, 323; Giiather, vii, 244.) 



aa. Toetli 4-5, with entire edges. (Alyloleucus Cope.t) 



408. L. obesilS (Grd.) Jor. 



Body stout. Head short, the muzzle not decurved. INIouth small, 



oblique, terminal, the lower jaw somewhat projecting, maxillary nearly 



reaching to orbit. Eye 4} in head ; preorbital deeper than long. Color 



dark; the belly silvery; the scales everywhere dusted with black specks; 



a dusky lateral band. Head3f; depth 3 ?j. D. 9; A. 8; scales 12-58-7 



(13-58-9, Cojjc); teeth 5-4. L. G inches. Utah Basin; abundant. 



{AlijanMci ohcua Girard, Proc. Aead. Nat. Sci. Phila. 185G, 183, and U. S. Pac. R. R. 

 Surv. Fish. 239: Leuviscus obesus Giinther, vii, 244: Myloleuciis pulverulent us Cope, 

 Hayden's Geol. Surv. Mont. 1871, 475, 1872 ; Jordan «fc Henshaw, Rept. Chief Eug. 

 1878, App. NN. 192.) 



409. Li. foriiiosus (Grd.) .Tor. 



Very close to the next, and perhaps identical with it. Body a little 



more slender, the scales smaller, and- profusely dotted with black as in 



L. obesus. Head 3j|; depth 4. D. 8; A. 8; scales 10-53-G; teeth 5-4. 



L. 4 inches. California. 



{Algansea formosa GinxrH, Proc. Acad. Nat. Sei. Pliila. 18.56, 183: Lcuciscus formunun 

 Giinther, vii, 245; Jordan &, Henshaw, 1, c. 193.) 



* In specimens examined ; the normal number is probably 5-4. If permanently 4-4, 

 Ahjansea may be regarded as a distinct genus. 



t Girard, Proc. Acad. Nat. Sci. Phila. 18.5G, 184: tyjie Leuciscus Uncella Val. (A coined 

 name.) 



tCoi)e, Hayden's Geol. Snrv. Mont. 1871, 47.5, 1872: type Myloleucus imhtrulentus 

 Qo\}Q = Alganaea ohesa Girard. (/^i^AoJ, grinder; Acfxo?, Leucus.) 



