Jordan and Evcrmann. — Fishes of N'orth America. 1867 



13). No air bladder. Species of rather large size and bright coloration; 

 abundant in the North Pacific on both shores, extending southward from 

 Bering Sea. (f|, six; ypan/.ir), line.) 



a. Cheeks and opercles fully invested with cycloid scales, including area overlying 

 suborbital stay. Two pairs of cutaneous flaps on head. 



DECAGEAMMUS, 2258. 



aa. Cheeks not fully scaled, at least the area over suborbital stay naked. No flap on 

 occiput. 

 &. Fourth line of pores forking in advance of base of ventrals, the lower branch 

 running to base of anal fln. octogrammus, 2259. 



bb. Fourth line of pores simple, passing close to ventral fln. 



c. Cheeks and opercles largely naked, a pat«h of scales on upper portions 

 of cheek and opercles, and a small patch sometimes present on mid- 

 dle of cheek. stelleri, 2260. 

 cc. Cheeks and opercles largely scaled, the subocular ring, the region over- 

 lying the suborbital stay, and the interopercle alone naked. 

 d. Supraorbital flap long and slender, densely fringed, its length about 

 equal to the vertical diameter of orbit; scales largely smooth 

 posteriorly in the adult. superciliosus, 2261. 

 dd. Supraorbital flap small, little if at all longer tlian diameter of pupil. 

 e. Caudal very broad, the posterior margin convex even in the 

 closed fln ; scales smooth in adult. lagocephalus, 2262. 

 ee. Caudal narrower than in n. lagocejihalus, the posterior edge 

 emarginate when fln is closed. Scales smaller than in ' 

 any other species, those on sides of head and breast 

 minute, nearly uniform, less than i the size of those on 

 sides of body ; 11 or 12 scales in an oblique series between 

 second and third lines; scales on mid-ventral region 

 breast, prepectoral area, and sides of head, smooth, aU 

 others strongly ctenoid throughout life; first lateral line 

 extending beyond middle of second dorsal; fourth line 

 short, not reaching tips of ventrals; fifth line forking 

 behind middle of ventrals. Eye large, 4J in head. 

 Supraorbital tentacle very small. Anterior teeth in jaws 

 much enlarged, canine-like. Palatines toothless. Fin 

 membranes thin. Dorsal low, less deeply notched than 

 usual. Color brown, blotched and barred with darker, 

 many of the scales each with a silvery spot; no radiating 

 streaks about eye; black blotches on dorsal fin corre- 

 sponding to a .similar number on back along base of dor- 

 sal. D. XX, 23; A. 21. Size small. Known only from 

 Japan. H. otakii.* 



2258. HEXAGRAMMOS DECAGRAMMUS (Pallas). 



(Rock Trout ; Boeegat; Bodierox.) 



Head ii; depth 4. D. XXI, 24; A. I, 23; scales 112. Body elevated at 

 the shoulders, descending rather steeply at the nape; maxillary not reach- 

 ing middle of eye; a very few teeth on front of palatines; supraocular 

 flap smaller than in other species, shorter than pupil. Cheeks and opercles 

 entirely scaled ; scales on the body all strongly ctenoid. Snout, jaws, pre- 

 orbital, interopercle, and adjacent portion of preopercle scaleless; breast 



(ColYxSuke OtokfJ" ^"^^"^ ^ ®^^^^' ^™''- ^^^- ^*'- ^"^^ ^«^^' ^°*^' Yokohama. 



