159 
Height 4?/,—5, head 3°/,—4'/,, eye 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 
'/, 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. Myctophum coccot (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 g—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, 64 11, 6+ 12, 64 13, 7+ 12. The two Pre are on 
the same level, in case the posterior AO are numerous, the 
Pre 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 
