82 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 97 
or 42 in lateral line), ctenoid, apparently covering the head also, 
where at least some (and perhaps most or all) of them are cycloid; 
those in lateral line conspicuously deeper than surrounding scales. 
Dorsal fin higher than long, none of the rays produced, its origin 
a little nearer tip of snout than caudal base and almost directly over 
insertion of pelvics. Origin of adipose over that of anal fin, its free 
margin slightly fimbriate. Anal higher than long, its origin a little 
more than 114 times nearer caudal base than insertion of pelvics. 
Pectorals lateral, inserted low (much nearer belly than lateral line), 
with narrow basis, the middle rays long and slender. Pelvics 
abdominal, 8-rayed. Caudal fin well developed, moderately forked, 
free from anal. 
No photophores. Air bladder present. Pseudobranchiae rudi- 
mentary. Anus just before anal fin. 
Maxillary extending beyond eye a distance about equal to diameter 
of eye, greatly dilated posteriorly, slipping under preorbital ante- 
riorly ; provided with a single slender supplementary maxillary, about 
one-third length of maxillary. Premaxillary long, slender, forming 
entire outer margin of upper jaw. Dentary broadest at symphysis, 
tapering gradually posteriorly. 
Teeth finely granular, covering inner and outer surfaces of both 
jaws (except at the symphyses) so that they are clearly visible when 
the mouth is closed. Vomer angular, not indented at apex where it 
‘is widest, covered by finely granular teeth (fig. 2) ; same kind of teeth 
on the long, slender, tapering palatines and on the rounded entop- 
terygoids. Tongue small, toothless, bound-down at the tip, with 
finely granular teeth on the long, narrow basihyal. 
Branchiostegals usually 10 (9 on the right side in 2, 11 on the left 
side in 1, out of 29 specimens counted), slender, curved, becoming 
progressively more flattened from lowermost to uppermost. Gill 
membranes attached far forward, free from isthmus. Gull rakers on 
first arch rather long, slender, denticulate; those on succeeding arches 
shorter and spinulate at their tips. 
Mesethmoid with a low, median ridge. Palatine with anterior end 
attached to vomer by a ligament, with a process directed upward and 
outward that overlaps the proximal end of the maxillary and is 
supported by a lateral projection of the mesethmoid. Parasphenoid 
extending upward to the frontals between the lateral ethmoids 
(Regan, 1911, pp. 121, 128). 
The technical characters of Solivomer agree closely enough with 
those used to delimit the family Myctophidae (Regan, 1911; Parr, 
1928; Bolin, 1939) that I refer it to that group of fishes. The lack 
of specializations, such as photophores, and the general normal ap- 
pearance of the new genus suggest that it is a primitive form low 
in the evolutionary line along which the myctophids have advanced 
