242 
Depth 3 l/2 (young) to 12 l/2; head 7 to 8 2 / 3 . ~nout 3 3/4 in he d from 
snout tip; eye 4 l/4 to 6, 1 2/3 in snout; maxillary extends 1 2/3 eye diamet¬ 
ers in snout: maxillary extends 1 2/3 eye diameters behind eye, length 1 l/2 m 
head; 5 fixed teeth in lower jaw: pair of teeth on basibranchials; barbel l/4 
vo 2/3 length of head, stem black,ending in simple ite portion, scarcely broad-j 
er than stem in adults but forming more or less definite bulb in young; inter¬ 
orbital low. 
Lateral ohotophores 32 to 35 between gill opening and ventral, 12 to 14 be- 
r een ventral and anal; ventral series 10 or 11 between isthmus and pectoral, 
34 to 36 between pectoral and ventral, 13 to 15 between ventral and anal, 12 or 
13 between anal and caudal. Postocular luminous or^an little less than eye. 
D. 20 to 23. fin height 2 l/8 in total head length; A. 23 to 26, fin height 
2 2/5; caudal 2 l/3, forked; least depth of caudal peduncle 6; pectoral 4 l/2, 
t 
rays 7 to 9; ventral 1, rays 7* 
Length 290 mm* (Norman.) 
North and South Atlantic. 
Odontostomias mastioopogon Norman 
Odontostomias mastioopogon XT0P0.IAN, Discovery Hep., vol.2 5 1930, p. 00, fig.19. 
o 0 
N. 13 25 ? W. 18 22 f , 900 meters. 
Depth 9 l/2; head 7 2/5. Snout 4 in head from snout tip; eye 5 3/4, 1 l/3 
in snout; maxillary extends eye diameter behind eye, length 1 1/2 in head; 4 
fixed teeth in lower jaw; no teeth on basibranchials; barbel 1 l/3 times length 
of fish, bulb and possibly part of stem broken off apparently; interorbital low. 
Lateral photophOres 35 
from, gill opening to ventral, 15 from ventral to anal 
