468 
PACIFIC SCIENCE, Vol. XV, July 1961 
In alcohol, color of tail and back whitish, 
abdomen and head, excepting the colorless 
snout, blackish. Body wall along most of anal 
base colorless and transparent. End of caudal 
peduncle blackish. A series of about 28 black 
spots running from nape almost to caudal base. 
Two specimens contain ovaries, the eggs 
larger in one than in the other. 
D. oculatus has not been reported previously 
from the Hawaiian Islands although it is known 
to inhabit adjacent parts of the North Pacific, 
as well as the eastern Pacific from off Lower 
California to Monterey Bay. 
Argyripnus atlanticus Maul 
Figs. 4, 5 
MATERIAL EXAMINED: 2 specimens, stand- 
ard length 27 or 27.5 mm. and 35.5 mm., col- 
lected off the Mauna Loa lava flow, Hawaii, by 
Moore et al ., June 3, 1950. 
Smaller specimen in poor condition; head, 
tail, and abdomen severely damaged; adipose 
fin, latter part of anal fin, last group of AC 
photophores, and isthmus IV mostly lost; ab- 
dominal IV damaged. Dorsal rays 12. Anal rays 
ca. 12 in front of AC group of five photophores. 
Pectoral fins short and fleshy, rays discernible 
under magnification but not clearly enough to 
be counted. Gill rakers on first arch 19 + 5 = 
24 on left side, 19 + 6 = 25 on right side, 2 in 
angle. Depth 5-5.5 mm. Head and trunk shorter 
than tail, distance between snout and anal origin 
ca. 12-12.5 mm. and between first anal ray and 
base of middle caudal rays 15 mm. Anal origin 
below about fourth dorsal ray. BR (6). IV on 
isthmus (6) on one side, apparently straight, 
not curving upward posteriorly; abdominal IV 
(10), hanging loose from body, possibly in- 
complete. First VAV-AC group (14), probably 
not fully developed, first 6 or 7 in front of anal 
fin and larger than remainder. Middle group of 
AC (5). OA lost on one side of body, (2) on 
other side, remainder probably still undeveloped. 
Color in alcohol yellowish; upper half of body 
with a double series of small black chromato- 
phores from nape to tail and a third, incom- 
plete, row running posteriorly from above anal 
origin. 
Larger specimen, 35.5 mm., in fairly good 
condition although difficult to measure, being 
bent. A few large, thin, cycloid scales remain- 
ing on back and sides. Dorsal rays 11. Anal rays 
15 + 10 == 25, a short space filled with mem- 
brane below third and fourth organs of the AC 
group of (5), separating the two groups of 
rays. Pectoral rays 18. Gill rakers on first arch 
19 + 6 = 25, 2 in angle. 
Measurements in millimeters: depth 8; head 
11; snout 2-2.5; orbit ca. 4; interorbital width 
at center of eye 2-2.5; upper jaw 7-7.5; pre- 
maxillary 3—3.5; toothed portion of maxillary 
4-4.5; tip of snout to dorsal origin ca. 17, to 
anal origin 15.5, to ventral base ca. 12.5-13; 
distance between first anal ray and base of mid- 
dle caudal rays 18.5—19, last anal ray and base 
of middle caudal rays ca. 6.5, last dorsal ray 
and base of middle caudal rays ca. 15; least 
depth of caudal peduncle 2.5-3; dorsal base 
3.5-4; anal base ca. 11.5; pectoral length 6.5-7; 
adipose base 1.5; distance between VAV-AC 
group of photophores and group of (5) 3.5 
FIG. 4. Argyripnus atlanticus, standard length 35.5 mm. 
