202 Transactions. 



the peduncle long and narrow, its depth one-fourth more than the diameter 

 of the eye. 



Scales. — Head generally naked, but with scales on the opercles ; upper 

 part of head with a spongy porous integument. The body-scales are not 

 markedly deciduous, are of moderate size, and finely denticulated ; they 

 extend on to all the vertical fins. The lateral line does not follow the curve 

 of the back, excepting for its anterior half, the hinder part being almost 

 straight. 



Length, 945 mm. The type was 990 mm., doubtless measured to the 

 end of the longest caudal ray. 



Colours. — Steel-blue above, silvery beneath. 



The genus Etirumetopos, of which E. johnslonii is the type and only 

 known species, may be thus defined : Body oblong, compressed ; snout 

 obtuse ; mouth large ; teeth present only in the jaws. Premaxillaries 

 slightly protractile, maxillaries with supplemental bone ; they are not 

 entirely concealed by the preorbitals when the mouth is closed. Opercular 

 bones thin, entire ; branchiostegals 7 ; gill-membranes united far forward, 

 not attached to the isthmus, pseudobranchiae developed ; gill-rakers long ; 

 scales of moderate size, fairly adherent, lateral line not concurrent with 

 the dorsal profile. A single dorsal fin with about IX, 20 rays ; anal with 

 about III, 15 rays ; pectoral pointed, with 20 rays ; ventrals below the 

 pectorals. Vertebrae 22. 



The genus appears to be sufficiently established, and finds its nearest 

 ally in Psenopsis Gill, differing in the larger mouth, the character of the 

 maxillaries, the more adherent scales of relatively smaller size and their 

 development on to the bases of the dorsal and anal fins. The lateral line 

 is not concurrent with the dorsal profile, and the number of rays in the 

 vertical fins is noticeably smaller. 



The following notes are supplied for the convenience of those wishing 

 to make a further comparison : In 1862 Gill* erected the genus Psenopsis 

 for Trachynotus anomalus Schlegel, a species taken in Japanese seas.f 

 The affinities of the fish were previously recognized by Bleeker (1853), J 

 who placed it in the genus Psenes. Regan § has more recently added 

 Bathyseriola cyanea Alcock,|| from Indian seas, to the genus Psenopsis, 

 remarking, " There can be no question that these two species belong to 

 the same gemis, although their relationship has not hitherto been suspected, 

 and the two species are very closely allied." 



EXPLANATION OF PLATES. 

 Plate X. 

 Aegoeonichtl ys avpelii Clarke. Less than half natural siz<\ 



Plate XI. 

 Oreosoma atlanticum Cuvier and Valenciennes. Nearly twice natural size. 



Plate XII. 

 Eurwudopos johnslonii Morton. One-fifth natural size. 



* Gill, Proc. Acad. Phil., 1862, p. 157. 



t Schlegel, Fauna Japon, Poiss., 1850, p. 107, pi. 57, fig. 2. 



X Bleeker, Verh. Bat. Gen., vol. 26, 1853, p. 104. 



§ Regan, Ann. Mag. Nat. Hist. (7), vol. 10, 1902, p. 130 (also see for further references.) 



|| Alcock, Cat. Indian Deep-sea Fishes, 1899, p. 43, pi. 17, fig. 1. 



[The three papers last quoted are the only ones I have been able to consult, but 

 Mr. McCulloch has kindly assisted me by referring to others in the Australian Museum 

 library.] 



