FISHES — CYPRINIDAE — PTYCHOCHEILUS VOEAX. 



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lateral line, is dark brownish black, darker along the dorsal region, properly so called, than 

 along the flanks, which assume a somewhat clouded aspect. The inferior surface of the head, 

 up to the mouth, and the abdominal region, properly so called, are whitish. The vertical fins 

 exhibit a rather dark tint, whilst tbe horizontal fins are dull yellow. 



Etferences to the figures. — Plate LXV, lower figure, represents Ftychocheilus rapax, somewhat 

 reduced in size. The upper left figure is a dorsal scale. The middle figure, a scale from the 

 lateral line. The upper right figure, a scale from the abdominal region. 



List of specimens. 



4. PTYCHOCHEILUS VORAX, G r d . 



Spec. Char. — Body of moderate length, rather deep upon its middle, and very much tapering poBteriorly. Peduncle of the 

 tail very slender. Head email, contained nearly 'five times in 'the total length. Posterior extremity of maxillar bone extending 

 to a vertical line drawn across the anterior rim of the orbit. Eye moderate ; its diameter entering about six times and a half in 

 the length of the side of the head. Anterior margia of dorsal fin somewhat nearer the insertion of the caudal than the extremity 

 of the snout. Bluish grey above ; whitish beneath. 



S,YS. —Plychocheilun vorax, Grd. in Proc. Acad. Nat. So. Philad. VHI, 1856, 209. 



The bead is also depressed in this species, but it is much smaller, since it constitutes nearly 

 the fifth of the entire length. The body is much deeper than in P. lucius. The greatest depth 

 measured immediately in advance of the dorsal fin is nearly equal to the length of the head. 

 The dorsal fin is not situated so far back, whilst the ventrals are inserted more in advance of 

 the dorsai. The dorsal itself is much higher, and the anal much deeper, than long ; both of 

 these fins are well developed ; the anterior margin of the anal being nearer the isthmus than the 

 tip of the inferior lobe of the caudal. The posterior extremities of the ventrals do not quite 

 extend to the vent ; their origin is nearer the extremity of the snout than tbe insertion of the 

 caudal. The pectorals are elongated, sub-lanceolated, their extremities being nearer the insertion 

 of tbe ventrals than in any other species so far alluded to. 



D 2, 9 ; A 2, 8 + 1 ; C 9, 1, 9, 8, 1, 10 ; V 1, 10 ; P 18. 



The scales are rather small, and very much so upon the dorsal region between the dorsal fin 

 and the occiput ; they are almost minute over the abdomen, between the isthmus and the ven- 

 trals. They are but imperfectly imbricated, even along the middle of the flanks where they are 

 the largest, and much longer than deep. Indeed, they appear to be longer than deep upon all 

 the regions of the body. The lateral line undergoes quite a deflection along tbe abdominal 

 region, so as to approximate the insertion of the ventrals a great deal more than the base of the 

 dorsal fin. 



Tbe upper regions are bluish grey, whilst the predominating tint beneath is whitish or 

 yellowish, with a metallic reflect. The fins themselves are yellowish. 



