112 
small* Pseudobranchiae well developed. Scales moderate, thin, deciduous. 
Dorsal small, median. Adipose fin present. Anal posterior moderate or long. 
Caudal forked. Paired fins well developed, ventral opposite dorsal. 
ANALYSIS OP SPECIES 
1 
a. Head 4 to 5. 
1 
b. Dorsal origin nearer snout tip than caudal base, 
1 
c. Anal 13; depth 4 l/4 atlanticus. 
2 
c_. Anal 16 to 25; depth 5 to 7 l/3. 
1 
d. Eye 2 3/5 in head; head 5 1/4 to 5 l/3 microcephalus. 
2 
d. Eye 2 to 2 l/2 (rarely 2 3/5; head 4 to 4 2 / 3 . 
1 
e. Anal origin 2 2/3 to 3 l/5 times as distant from snout end as from 
caudal base; anal fin base 4 l/2 to nearly 6 in fish. 
1 - '' ■ 
f. Depth 6 to 7 l/3; Anal 18 to 21. 
1 
Depth 6 to 6 l/4; head 4 l/8 to 4 l/3; intero^cular 2 3/4 to 3; 
dorsal origin nearer adipose fin than snout end 
glacialis. 
2 
Depth 7 to 7 l/3; head 4 l/4 to 4 3/5; interorcular 4 or more in 
O 
r i. 
, head; dorsal origin equidistant between snout end and adipose fin 
4KV :f 
gracilis. 
2 
f. Depth 5 to 5 3/4; Anal ustxally 19 to 25. 
1 
h. Head 4 l/3 to 4 3/5; eye 2 1/5 to 2 l/2 equals or less than post 
orbital; Anal 22 to 25, base length 4 l/2 to 5 l/5 in fish 
% 
antarcticus• 
2 
h. Head 4 l/5 to 4 l/3; eye little over 2, greater than postorbital 
Anal 19, base length 5 3/5 to 5 2/3 in fish 
benedicti. 
