1873.] 



29 [Cope. 



ventrals into a single median line, which extends to the branchiostegal 

 fold. Radii, Br. VI; D. XIX, 25; C. IT. The interspaces scaled; the 

 margin nearly truncate; A. 26; V. I, 5; P. 18. Head scaled above and 

 on sides, except on interopercnlum and muzzle. Scales ctenoid; 13 — 

 94—34. The scales are elongate and nearly truncate distally; on the 

 sides they are in oblique series, but near the dorsal fin from three to five 

 rows exhibit scales superposed vertically. 



General color pale orange, with ill defined blackish shade on the 

 sides, and seven quadrate blackish spots at the base of the dorsal fin; 

 below, bright yellow. Dorsal and caudal fin yellowish at base, margins 

 with a broad blackish band; three black spots on the middle of the 

 first, and four on the middle of the second dorsal fin; anal yellow, with 

 seven blackish blotches extending anteriorly across the rays; pectoral 

 yellow, with brown spots on the rays and a black one at the base in 

 front; eye, with five blackish radii, diverging— two anteriorly, one 

 upward and backward, one backward, and one downward and backward. 

 Total length, fourteen inches; length of head entering it 4.33 times; 

 depth of body, four times in the same; eye, five times in head, 1.66 times 

 in muzzle, and 1.25 times in interorbital width. 



This fine species is more nearly allied to the Chirus hexagrammus, Pall. 

 but differs in numerous respects. 



Chirus trigrammus. Cope, sp. nov. 



Established on a specimen of four inches in length, perhaps the young 

 of a species more like the C. ordinatw in size. It is related to the latter 

 in many points. There is a supraocular dermal flap, the dorsal fins 

 are united but a rather deep notch separates them. The scales are 

 ctenoid, not truncate, and are oblique-rowed up to the dorsal fin; 

 numbers, 11 — 107—32 ; counted transversely at anal fin. Lines of pores 

 three on the body, extending to the caudal fin; a series of pores without 

 tubes, extending along the anterior half of the base of the first dorsal, 

 and a short line of tubules extending from below the pectoral to the gill 

 membrane. The abdominal series unite on the median line and extend 

 to the gill-flap membrane, as in 0. ordinatus. Radii, Br. V; D. XXIII, 

 21: A. 25; P. 20. Length of head, 4.75 in total. Diameter of eye, 3.66 

 times in head; length, equal interorbital width. Front scaly to near 

 nares, opercula smooth. Depth 5.5 times in length. 



Color light brown to lateral line proper; below it, golden. Seven 

 quadrate brown dorsal spots; three quadrate black spots on each dorsal 

 fin. Sides with an open marbling of brown bands, which connect the 

 dorsal spots with some similar ones, which alternate with them, or form- 

 ing a few open meshes. Inferior and caudal fins unspotted. 



This species differs from the last in the deeper division and more 

 numerous rays of the dorsal fin, the less-developed lines of mucous 

 tubules, and the colorless anal and other fins. It is of less interest than 

 the two already described. The latter probably play an important part 

 in the domestic economy of the inhabitants of the Aleutian Islands and 



