35 
Pristisomtjs LATrS, sp. nov. 
PI. V, Pigs. 2, 4. 
Ohs. — Several specimens indicate the occurrence of a comparatively 
deep-hoclied species of Fristisomus, and the following three may he selected 
for special notice : — 
{(() The type-specimen, wanting the caudal pedicle and fin, shown 
of the natural size in PL V, Pig. 2. 
(h) A more imperfectly preserved fish, wanting: the head and paired 
fins (PI. V, Pig. 3). 
(c) Imperfect fish, with well-displayed pectoral fin (PL V, Pig. 4). 
General Form . — The trunk is comparatively high, the maximum depth 
lieing contained only two and a half times, or less, in the total length. The 
licad is triangular and the snout pointed, and the distance from the extremity 
of the snout to the posterior margin of the operculum is contained slightly 
more than four times in the total length. The dorsal fin is considerably 
longer than the anal and not remarkably elevated, and the candal fin is 
apparently small. 
Head and Opercular Apparatus . — In the type-specimen (PL V, Pig. 
2) the dentary bone is seen to lie robust, and the close array of styliform teetli 
is displayed ; but no other details arc recognizable, nor is any other specimen 
more satisfactory. 
Appendicular Skeleton. — The paired fins are placed well upon the sides 
of the trunk ; each of the pectorals exhil)iting not less than nine robust rays 
of considerable lengtli (PL V, Pig. 4), and tlie pelvics being much smaller, 
with at least six rays in the type-specimen. The pelvic pair is placed nearer 
to the anal than to the insertion of the pectoral pair ; and the dorsal and anal 
are opposed in the ordinary manner. The dorsal fin exhil)its seventeen rays 
in the type-specimen, and the length of the longest is much less than that of 
the base-line. The anal fin, which appears to he complete in No. h (PL V, 
Pig 3) is more elevated than tlic dorsal, comprising about fourteen rays ; but 
its longest ray scarcely exceeds the length of its base-line. The candal fin, if 
complete in No. b (PL V, Pig. 3), is relatively small, exhibiting twenty-two 
rays ; and the anterior margins both of this and the other median fins arc 
provided with prominent fulcra, with a few of especially large size at the 
base. A few interspinous bones in the anal of h are seen to correspond 
in number with the opposed fin-rays. 
lla 74—90 H 
