86 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 97 
were counted on 20 specimens. There were 4 or, usually, 5 rakers on 
the upper limb, 13 or 14 on the lower limb, and 1 at the angle of the 
arch, making a total of 18 to 20, usually 19 or 20. 
A detailed description of the detention of Solivomer, as well as 
of certain osteological and other characters, has already been given 
under the generic diagnosis. 
The following proportional measurements with precision dividers 
were made on 10 specimens grading in size (standard length) from 
98to270mm. Instandard length: Greatest depth of body 4.15 to 4.55 
head length 2.8 to 3.05; caudal peduncle length 5.9 to 6.7. In head 
length: Head depth 1.45 to 1.6; head width 2.2 to 2.4; snout 4.1 to 
4.4; eye 6.0 to 7.0; width of bony interorbital 4.5-5.1; maxillary length 
1.55 to 1.75; mandible length 1.5 to 1.6; least depth of caudal peduncle 
5.25 to 4.0; “length of Pectosal fin 1.3 id 1.55; length of pelvic fin 1.7 to 
92 postorbital length 1.55 to 1.65; lent of depressed dorsal fin 
1.3 to 1.45; length of depressed anal fil 2.05 to 2.35. Greatest width 
of maxillary 1.1 to about 1.4, usually 1.1 or 1.2, in diameter of eye. 
Origin of dorsal fin nearer snout than caudal base by a distance vary- 
ing between the diameter of the eye to the diameter of the orbit. 
Origin of anal fin much nearer caudal base than insertion of pelvics 
by a distance varying between the snout length to about one-half the 
length of the maxillary (as measured anteriorly to the tip of the 
premaxillary). 
The general coloration of the new genus, after 37 or 38 years in 
preservation, is a rather uniform brown except for the opercular mem- 
brane which is brownish black in many specimens. Many of the scale 
centers are light yellow or yellow-brown and the scale margins are 
dark brown. The basal portions of all the fins, particularly along 
the interradial membranes of the dorsal and anal fins, are dark brown. 
This type of pigmentation extends outward a considerable distance 
on the caudal fin, fading distally. Similar dark-brown pigment oc- 
curs between the anterior and posterior bony rims of the preopercle 
and along the lower margins of the mandibles. Around the orbits 
of several specimens are delicate, irregular narrow lines of dark pig- 
ment usually nearly vertical with the body axis. The same type of 
lines are found on the top of the head, running obliquely away from 
the midline on each side. 
Comparisons and relationships —Solivomer differs from all other 
known genera of the Myctophidae, except Scopelengys, in lacking 
photophores. That monotypic genus, though known only from a few 
specimens, also lacks these organs. At first sight the resemblances 
between Solivomer and Scopelengys are very striking. The general 
body form, oblique mouth, wide of gape, general shape and position 
of fins, slender supramaxillary, extent of dentition, and rudimentary 
pseudobranchiae are remarkably alike in the two genera. The sharp 
