IS 
General Form . — -The trunk is slender, and the head, with the 
opercular apparatus (if completely preserved in No. h), occupies less 
than one-fourth the total length of the fish. The dorsal fin appears 
precisely opposite the anal, and approximately equal to it in size ; and 
the caudal fin is deeply forked. 
Head and Opercular Apparatus. — The snout is obtuse, the eye 
large, and the mandible apparently slender. It may also he noted that 
some, at least, of the head hones are ornamented by superficial striae ; 
but nothing further can he observed of the structure of these parts. 
Appendicular Skeleton. — In all the fins the rays arc robust, hut 
very closely arranged, and bifurcating distally, and small fulcra arc 
prominent on the anterior margin of each. In No. d, the pectorals have 
relatively long rays, extending more than half the distance to the pelvic pair. 
The latter, well shown in PI. IV, Pig. G, arc powerful, consisting of at least 
eight or nine distally-hif urcating rays ; and there arc four slender basal fulcra 
in front, passing dowuAvards into the small fulcral fringe of the first ray. 
The dorsal and anal fins are nearly equal and opposite, suggesting the specific 
name of the lish ; hut the number of rays is greatest, as usual, in the anal, 
being here about sixteen or twenty. The anterior fulcra (PI. IV, Pig, 5«) 
arc similar to those of the i)clvic fins. 
Squamallon. — The scales are ornamented with faint oblique ridges or 
grooves, and the narrowing of the ventral series is very conspicuous in all 
the specimens. In No. c, the scales of the anterior portion of the flank are 
somewhat deeper than broad ; and each appears to have an inner vertical 
keel, mesially jhaced. 
Remarks . — In the position of the dorsal fin, and in general propor- 
tions, this species closely resembles D. macrura, T>. superstes, and T). socialis. 
It dilfers from the first in its smaller size, and both from this and the second 
in the presence of ornamentation upon the scales ; it is also distinguished 
from F. socialis by its smaller size and the less robust character of the 
caudal pedicle. 
Dictyopyge illustraxs, sp. nov. 
PI. lY, Pigs. 7-9. 
Ohs. — The most ahnndant and best preserved species is somcAvhat 
larger than the foregoing, and may he appropriately named D. illustrans, in 
