246 
PACIFIC SCIENCE, Vol. VII, April, 1953 
mentation, and massiveness of form. In this 
regard the subfamily Paralepidinae has two 
basic divisions. The members of one division, 
comprising the genera Paralepis, Magnisudis 
(described herein as new), and Notolepis, are 
scaled as adults and have numerous teeth in 
two or more rows on each gillraker; the gene- 
ra of the other division {Lestidium, Macropara- 
lepis, and Stemonosudis) are completely scaleless 
and have few teeth in one row on each gill- 
raker. This classification cuts across the sys- 
tem currently recognized in the literature. 
The new genus Magnisudis appears to be 
the most primitive in the family and shows 
the closest link back to the Chlorophthalmi- 
dae and Aulopidae, the most generalized 
families in the order Iniomi. The genus Noto- 
lepis has many unique characteristics and rep- 
resents the end point in scaled genera evolu- 
tion, approaching more closely the scaleless 
genera than do either Paralepis or Magnisudis. 
The genus Lestidium appears to be the most 
generalized of the scaleless genera and clearly 
approaches the scaled genera more closely 
than either Macroparalepis or Stemonosudis. 
The fishes of the family Paralepididae are 
world-wide in distribution, except for the 
Arctic. The genus Notolepis is bipolar (pan- 
temperate) in distribution. One of its sub- 
genera {Notolepis) is known from the Ant- 
arctic and the other {Profundisudis) occurs in 
the North Pacific and North Atlantic. Most 
of the other genera are also wide-ranging. 
The suborder Alepisauroidea appears to be 
represented in the Cretaceous by the family 
Ichthyotringidae (new name to replace Rhi- 
nellidae Jordan, 1905) and perhaps by the 
Dercetidae. Six fossil genera {Paralepis Cuvier, 
Trossulus Jordan, Lestkhthys Jordan, Drimys 
Jordan, Holosteus Agassiz, and Parascopelus 
Sauvage) and approximately 10 species of the 
Paralepididae are known from the Tertiary. 
Even as recently as the Miocene there seems 
to be intergradation between the Chloroph- 
thalmidae and Paralepididae, and as a result 
the Alepisauroidea became fully differentiated 
from the suborder Myctophoidea relatively 
recently. 
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