159 



Height 4 2 / 5 5, head 3 3 / 4 4 ! / 3 , eye 3V 3 4, longer than 

 snout, which is prominent and conical, more pointed in young 

 specimens. End of upper jaw not much dilated, extending 

 about one eye diameter behind eye, praeopercular margin some- 

 what oblique. Origin of dorsal before middle of length, behind 

 ventrals, which are situated in the beginning of the second 

 ] / 3 of the length ; end of dorsal somewhat behind the vertical 

 through origin of anal or slightly behind middle of length. 

 End of anal slightly behind vertical through adipose fin. 

 Scales cycloid. Luminous organs : a small dorsal and ventral 

 antorbital organ at the frontmargin of the eye. Two oper- 

 culars, the larger dorsal slightly below level of ventral orbital 



Fig. 61. Myctophtim coccoi (Cocco) (after Brauer). 



margin, the smaller ventral behind upper jaw. 5 equidistant 

 PO, between isthmus and ventrals. Posterior PVO at the 

 lower base of the pectorals, the anterior obliquely before and 

 below it, above the interspace between the second and third 

 PO. The small PLO slightly above and before the upper base 

 of the pectorals in the vertical through the anterior PVO. 



4 equidistant VO between ventrals and anus. 15 21 AO 

 (most frequently 18) arranged in an anterior group with 4 8 

 and a posterior group with 9 14. The whole anterior group 

 lies above the anal, the two anterior organs of which are 

 separated from the following by a somewhat larger interspace. 

 Of the posterior group nearly the whole anterior .half lies 

 also above the anal. Most frequent arrangements of AO are: 



5 + 13, 6+n, 64-12, 64-13, 74-12. The two Prc are on 

 the same level, in case the posterior AO are numerous, the 

 Prc are serially a continuation of them, VLO nearer to origin 

 of ventral than to lateral line. The 3 SAO arranged in a blunt 

 angle, the anterior and inferior one about above the second 

 VO, on the same level or somewhat lower than VLO, the 



