12 
with growth. No barbel. Dorsal opposed to ventrals, its origin 
far before that of anal, above the hindpart of which the small 
adipose fin is situated. Pectorals below the middle of the height. 
Caudal forked. Minute teeth in several rows on jaws, vomer, 
palatines, pterygoids and tongue. Gillmembranes free from each 
other and from isthmus. Pseudobranchiae present. Gillrakers 
long. 8—10 branchiostegal rays. Luminous organs on head, at 
least one before eye, 2 behind praeopercular margin, 3 on 
branchiostegal membrane; for those on the body see below. 
There may be infra- and supracaudal luminous scales or plates. 
(Fig. 59). 
In describing the luminous organs on the body we follow 
the terminology of Brauer as shown in fig. 58. 
Fig. 58. Myctophum laternatum Garm.4 (after Brauer). 
PO = Maculae pectorales PLO = M. suprapectoralis 
PVO = M. subpectorales VLO = M. supraventralis 
VO = M. ventrales SAO = M. supraanales 
AOa = M. anales anteriores a = antorbital organ 
AOp = M. anales posteriores =e br = branchiostegal organs 
Pol = M. postero-lateralis o = opercular organs. 
Pre = M. praecaudales 
Synopsis Of; the species: 
I. Luminous organs not divided by a black septum. 
A. Infra- and supracaudal luminous scales. (Zam- 
panyctus). 2 Pol, luminous organs kidney shaped MW, micropterum p. 154. 
B. No luminous scales. (Myctophum). 
1. Upper jaw extending to vertical through 
posterior margin of eye, its posterior end 
strongly dilated. 
@ 2 Pol. . oes ed we ww ees Be 0 We OHOUL TEMNGr aH Pisy. 
