105. CHIRID2E HEXAGEAMMUS. 641 



/. Gill-membranes scarcely united ; spinons dorsal greatly elevated in front; 



scales very rough. (Zaniolepincv) Z AXIOLEPIS, 353. 



ff. Gill-membranes broadly united; dorsal spines low, stiff; head pointed. 



(Oxylcbiinw) OXYLEBIUS, 354. 



dd. Gill-membranes united to the narrow isthmus; preopercle unarmed; anal 



spines weak or obsolete. 

 g. Dorsal fins connected. (Agrammina:.) 



h. Anal* comparatively short, its rays about 12; palatine teeth present. 



MYKIOLEPIS, 355. 



gg. Dorsal fins widely separated; body and head rather slender. (Anoplo- 

 pomince) AXOPLOPOMA, 356. 



351. HEXAGRAMlTIUSt Steller. 

 Rock-trout. 



(CMnts Steller: Ldbrax Pallas : AcantholeMus Gill: Chiropsis Girard.) 

 (Steller; Tilesius, Act. Acad. Petropol. ii, 335, 1810: type Hexagrammus asper Steller.) 



Body oblong, somewhat compressed. Head subconical, blunt in 

 profile. Mouth rather small, horizontal; jaws with bands of moderate- 

 sized, conical teeth, the outer row enlarged; teeth on vomer, and usu- 

 ally a small patch on the palatines; preopercle unarmed; a fringed 



* Anal rays about 20 in Agrammus schlegeli, a Japanese species. 



tThe following species from the coast of Kamtschatka, related to Hexagrammus, 

 have been made the types of distinct genera. These genera may be valid, if the 

 characters assigned are correct, which is doubtful: 



GRAMMATOPLEURUS Gill. 



(Gill, Proc. Acad. Nat. Sci. Phila. 1861, 106: type Labrax lagocephalits Pallas. 



Distinguished from Hexagrammus by the cycloid scales, (ypa/njn^, line; TtXevpov, 

 side. ) 



G. lagoceplialns (Pallas) Gill. 



Five lateral lines; mouth rather small; color golden-brown. D. XX-24; A. 22. 

 Kurile Islands. 



(Labrax lagocepJialus Pallas, Me"m. Acad. Petcrsb. ii, 384, 1810: CMnts lagocephalus 

 Giinther, ii, 92.) 



OCTOGRAMMUS Bleeker. 



(Bleeker, Versl. At. Amst. vi, 1370: type Labrax octogrammits Pallas = Octogrammus 

 pallasi Bleeker. ) 



Distinguished from Hexagrammus by the union of the gill-membranes to the isth- 

 mus (?). (OHTO, eight; ypajujarf, line.) 



0. pallasi Bleeker. 



Olivaceous; back and sides spotted; belly yellow; pectorals hyaline; veutrals 

 black at tip: four lateral lines; mouth moderate; scales strongly ctenoid; body 

 elongate; dorsal deeply notched. "Flabella branchio stega divisa." D. XIX; A. 

 24. Kamtschatka and Aleutian Islands. 



(Labrax octogrammus Pallas, 1. c. 393: Chirus octogrammus Giinther, ii, 92; Bleeker,. 



1. c. ;= Hexagrammus dccagrammus 1 ?) 



Bull. Nat. Mus. No. 16 41 



