1705 
Analysis of Genera 
a . Luminous organs present, usually as photo- 
phores. 
b J ~. Myctophlnae . Photophores In distinct and 
1 
c . 
d 
arrangement. 
Supracaudal and infracaudal luminous 
bodies, when present as series of de¬ 
fines scales, 
Precaudal photophores 2. Myctophum. 
Precaudal photophores always more 
1 
e . 
than 2, 
Antorbital luminous organs not con¬ 
spicuously enlarged; supracaudal 
and infracaudal luminous organs 
present. 
Lampanyctus 
2 
e . 
Antorbital luminous organ conspicu¬ 
ously enlarged; supracaudal and 
infracaudal luminous organs rare r 
ly present 
Diaphus 
Large undivided median supracaudal and 
infracaudal luminous plate in place 
of several normal scales. Lampadena 
