20 
01‘ the paired tins, the peetorals are indicated in No. h (PI. IV, Pig. 8) 
hy a few powerful rays ; and in the same fossil the smaller pelvic fins 
apparently exhibit a long base-line. The dorsal and anal fins are elevated 
and triangular in form, and the first is placed almost entirely in advance of 
the second ; the dorsal is also consjiicuously smaller than the anal, the 
one, in the type-specimen, exliibiting about twenty rays, while the other 
has not less than twenty-eight. The basal fulcra are long and slender, 
passing upwards into the fine fnlcral fringe upon the first ray, exactly as 
figured hy Egerton in 2). supersles.^ The caudal fin is well shown, of twice 
the natural size, in PL IV, Pig. 9 ; it is robust and moderately forked. The 
rays are (dosely apposed find finely jointed, and there are distinct fulcra 
above and below. 
Squamation . — The scales of the flank are at least as deeji as broad, 
while those of the ventral series are twice as broad as deep. They are best 
seen in the type-specimen, and the posterior two-thirds of the surface 
of each is ornamented with sparse oblique markings, which may have 
originally been cither grooves or ridges. In some of the flank-scales (PL IV, 
Pig. 7rt), two of these markings are observed ; in a few placed most anteriorly, 
tlierc arc perhaps three, sometimes wavy. The ventral scales (PL IV, Pig. 
7(5') have mostly only one such suj^erficial mark. The small diamond-shaped 
scales upon the upper lobe of the tail have a single diagonal ridge or furrow, 
inclined forwards and downwards ; and upon the superior margin of this short 
pointed lobe are a series of very large fulcral scales, passing upwards into the 
small fulcral fringe upon the edge of the fin. 
Remarks. — J). illustrans dilfers from all known species except I), 
catopterus in the comparatively fonvard position of the dorsal fin ; and it is 
readily distinguished from this species by the greater depth of. the trunk and 
the smaller dimensions of the caudal fin. 
Eictyopyge eobusta, sp. nor. 
PL III, Figs. 4, 5. 
A very robust species referable to Rictyopjyge, as here defined, is indi- 
cated by a few imperfectly ju’cservcd specimens, of which the following are 
characteristic : — ■ 
(a) Type-specimen (PL III, Pfig. 4). 
* Quart. Joum. Cieol. Soc., Vol. xiv, PI. xi, fig. 3. 
