31. CYPRINIDyE STYPODON. 223 



the eye. Eye large, 3^ in bead. Scales moderate, very silvery. Lat- 

 eral line slightly decurved. Fins rather high. Dorsal fin rather in ad- 

 vance of vcutrals. Caudal fin with its rudimentary rays few and little 

 developed, the two lobes equal. Brownish above, with black dotsj 

 sides and below bright silvery. Head 4^. D. 9 ; A. 8 ; Lat. 1. GO ; teeth 

 2, 5-(4, 2). L. 4 inches. Presidio, Oal. 



{J'ogonichlhijs argijreiosus Girard, Proc. Acad. Nat. Sci. Pbjla. 1854, 154: Leucosomug 

 argifrcio8iis Giiuther, vii, 207.) 



07.— POCSONBCHTHYS Girard. 



(Cjlirard, Proc. Acad. Nat. Sci. Phila. 1854, 136 : type Pogonichthys incequilohus B. &, 

 G.= Leudscus macrolepidotus Ayrcs. ) 



Body elongate. Head small, conical. Mouth moderate, terminal, 

 normal ; maxillary with a well-developed barbel j premaxillaries i)rotrac- 

 tile. Teeth 2, 4-5, 2, or 2, 5-5, 2, hooked, with well-marked grinding 

 surface. Scales rather large. Lateral line continuous, decurved. Dor- 

 sal fin beginning rather in advance of ventrals. Anal basis short. 

 Caudal fin with its radimentary rays numerous and greatly developed, 

 supported by strong apophyses of the caudal vertebrae, the upper lobe 

 of the fin considerably longer than the lower. Intestinal canal short j 

 I)eritoneum brownish. Species of large size, (-co^wv, beard ; lyJ)oq, fish.) 

 351. P. macrolepidotus (Ayres) Jor. — Split-taU. 



Body elongate, somewhat compressed, the back a little elevated, the 

 form somewhat that of Cycleptus. Head short, slender. Mouth mod- 

 erate, nearly horizontal, the maxillary reaching front of orbit ; lower 

 jaw included; preorbital longer than deep. Eye large, 4:^ in head; 

 interorbital space convex. Dorsal fin midway of the body, rather in 

 front of the ventrals. Scales rather large, moderately imbricated. Lat- 

 eral line decurved. Fins rather large ; upper lobe of caudal half longer 

 than head. Coloration uniform, somewhat silvery. Head 4i; depth 

 33. D. 9; A. 8; scales 10-GC-G; Vert. 26 -f 15; teeth 2, 5-5, 2. L. 12 

 inches. Rivers of California. Singularly distinguished from our other 

 Oyprinidcc by the great development of the upper lobe of the caudal and 

 its rudimentary rays. 



{Pogonichlhijs inceqnUolus Baird & Girard, Proc. Acad. Nat, Sci. Phila. 1854, 13G 

 (August), aud U. S. Pac. II. R. Surv. x, 245: Leucosomus incequilohus Gliutbcr, vii, 271: 

 LeuciscHS macroU'pidoius Ayrcs, Placer Times aud Transcript, 1854, May 30 ; Jordan, 

 Proc. U. S. Nat. Mus. 1880, 326.) 



07 {h). STYPODON Garman. 

 (Gannan, Bull. Mus. Comp. Zool. viii, 90, 1881 : type Stypodon signifer Garm.) 



Body oblong, compressed, covered with large, deciduous scales. Lat- 

 eral line complete, decurved. Dorsal and anal fins short. Mouth small, 



