1383 
Analysis of families 
Myctopholdea . Mouth not or but little protractile; 
interopercle not reduced; clavicle attached to 
supraclavicle at lower end of latter. 
. No photophores. 
c 1 . Teeth in jaws in bands of several series, 
d^. Dorsal postmedian; rays of some fins fila¬ 
mentous. 
Aulopidae. 
a 2 . 
Dorsal premedian; rays of fins without fila¬ 
ments. 
Synodontidae. 
c . Teeth uniserial or in very narrow bands in 
jaws; some lower or palatine teeth may be 
fang like. 
p 
b . Photophores present, rarely or only occasionally 
absent. 
Myctophidae 
a . Aleoldosauroldea ., Mouth not protractile; dentition 
wswmn&t &em « .m nw » iig n . ... . 
strong; interopercle reduced; clavicle attached 
to supraclavicle at or near upper end of latter, 
which extends downward and backward and has upper 
postclavicle attached to its terminal end. 
e . Eyes not telescopic. 
f 1 . Eye normal, without orbital cavity ex¬ 
panded downward. 
