ICHTHYOLOGICAL COLLECTIONS OF THE ALBATROSS. 405 



3333, north of the Aleutian Islands, in depths of 19 to 71 fathoms; but the species is 

 evidently not abundant in Bering Sea. No examples were taken in any of the very 

 numerous dredgiuos made in Bristol Bay. 



In life the sides are olive-brown, and the upper parts show faint traces of 6 or 7 

 broad dusky crossbars, which correspond to or alternate with an equal number 

 below the lateral line. I'he anal and ventral fins, the branchiostegal and gular 

 membranes, the lower pectoral rays, and the snout are blue-black. Anterior edge 

 of orbit and front edge of preorbital light yellow. The pores on edge of preopercle, 

 two pores above and behind maxillary, and three at upper edge of opercle, bright 

 scarlet. A large black blotch on anterior dorsal rays. Distal half of anterior 

 portion of dorsal fin and upper pectoral rays yellow. 



The outer ventral ray is single and inarticulate, followed by five branched rays. 

 Only the first two dorsal rays are spinous, being soft and flexible, but unjoin ted. The 

 third and all following rays are jointed and forked. All the anal rays are jointed. 



A specimen from station 3211, 35 mm. in length to base of caudal, shows that the 

 ventrals occupy very different positions in adults and in young. In the latter they 

 are truly thoracic in position and are inserted as much behind base of pectorals as 

 they are located in advance of this point in adults. A specimen 65 mm. long is 

 entirely similar to adults in this respect. . 



35. Bathymaster jordani Gilbert. 



A single small specimen, agreeing perfectly with the description of the types, from 

 Bristol Bay, station 3262, depth 43 fathoms. The species has been heretofore 

 reported only from Paget Sound and from Wrangell, Alaska, and the present record 

 forms a notable extension of its range. It can be distinguished at sight from 

 B. signatus, the common Alaskan form, by its slender body, scaly cheeks, and the 

 enlarged scales of the lateral line. 



Family CHIRIDiE. 



36. Pleurogrammus monopterygius (Pallas). 



A single specimen of the Atka mackerel, which had been taken several years before 

 in the harbor at Unalaska, was presented by the Alaska Commercial Company. The 

 species is almost unknown at Unalaska. 



37. Hexagrammus ordinatus Cope. 



This species is closely related to H. asper, the dorsal being continuous but well 

 notched at union of soft and spinous portions, the scales ctenoid throughout except 

 on under parts of body, and the cheeks and opercles partly naked. The two species 

 differ conspicuously in shape, color, and fin formuhe. 



H. asper is very slender in shape, tapering rapidly from below front of spinous 

 dorsal backward to the very slender caudal peduncle. In H. ordinatus the depth is 

 greater and diminishes very slowly backward, the body tapering gradually into a 

 high compressed caudal peduncle. The vertical height of caudal peduncle etxuals 

 distance from tip of snout to or beyond middle of eye in H. ordinatus, while the same 

 measurement is less than length of snout in H. asper. In H. ordinatus the snout is 

 shorter and more bluntly rounded, the eye smaller, the mouth smaller, and the cheeks 

 shorter and wider. The squamation is also more complete, the cheeks being entirely 

 invested, except for the area immediately overlying the suborbital stay. The snout 

 and the lower side of the head, including the interopercles, are also devoid of scales. 

 The breast is covered with scales which have no spinous points, and the same is true 

 of the ventral scales in adults, but the body is otherwise invested with strongly 

 ctenoid scales, which extend well upon the bases of the fins, the caudal fin being 

 covered to behind its middle. 



The upper line of mucous pores is well developed, reaching to opposite middle of 

 soft dorsal. Anteriorly the two lines converge, typically meeting at a point just 



