FISHES CYPRINIDAE PTYCHOCIIEILUS GRAXDIS. 



299 



The upper edge of the dorsal fin is sub-concave, otherwise trapezoid in shape. The anal fin 

 is somewhat smaller than the dorsal, similar to it in shape, even sub-concave upon its postero- 

 inferior edge ; its anterior margin is nearly equidistant between the isthmus and the tip of the 

 inferior lobe of the caudal ; its base entering about twelve times and a half in the total length. 

 The ventrals are posteriorly sub-truncated, somewhat rounded off ; their extremities just reach 

 the vent. The pectorals are elongated, posteriorly rounded, and, when expanded, sub-ovate in 

 their outline. 



D 2, 9 + 1 ; A 2, 8 -f- 1 ; C 8, 1, 9, 8, 1, 8 ; V 1, 9 ; P 1.6. 



The scales are deeper than long, somewhat irregular in their outline, with distant radiating 

 furrows upon the posterior half, all directed backwards. 



The upper surface of the head and the dorsal region are dark reddish brown, whilst the 

 sides and the abdomen are whitish, with a silvery reflect. The fins are unicolor, either greyish 

 olive or yellowish, according to the region of the body where they are inserted. 



References to the figures. Plate LXIY, fig. 5, represents, size of life, a young individual of 

 Ptychocheilus oregonensis, from Fort Vancouver. Fig. 6 is the inferior surface of the head, in 

 order to exhibit the outline of the mouth. Fig. 7, a dorsal scale. Fig. 8, a scale from the 

 lateral line. Fig. 9, a scale from the abdominal region. 



List of specimens. 



2. PTYCHOCHEILUS GBANDIS, Grd. 



SPEC. CHAR.- Body very much elongated, sub-fusiform in profile. Head well developed, elongated, contained about four 

 times and a half in the total length. Mouth deeply cleft ; posterior extremity of the maxillary extending to a vertical line 

 intersecting the middle of the pupil. Eye small ; its diameter entering about ten times in the length of the side of the head. 

 Isthmus very narrow. Anterior margin of dorsal fin a little nearer the extremity of the snout than the tip of the upper lobe 

 of the caudal. Fins well developed. Scales moderate. Upper regions olivaceous ; flank and belly whitish or yellowish. 



SYV. Gilagrandis, AYRES, in Proc. Cal. Acad. Nat. Sc. I, 1854, 18. 



Plychocheilus major, AGASS. in Amer. Journ. of Sc. 2d Ser. XIX, 1855, 229. 

 Ptychocheilus grandis, GRD. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 209. 



The largest specimen which we have examined measures over twenty-one inches in total 

 length. The head is somewhat sub-quadrangular or sub-pyramidal, more or less depressed 

 upon the frontal region. The upper edge of the dorsal and the inferior edge of the anal fins are 

 nearly linear, somewhat sub-concave ; the anterior margin of the anal is nearer the tip of the 

 lower lobe of the caudal than the isthmus. The insertion of the ventrals is much nearer the 

 extremity of the snout than the tip of the caudal fin. These fins are broad and posteriorly 

 rounded off, not reaching the vent with their extremities. The pectorals are likewise very 



