166 
ACTINOPTERrGIT. 
vacuity ; and four slender basals can be seen supp or ^ lD ® 
the appended pectoral fin (pet.). The vertebral centra &r 
obscure, but their arches are distinct: the charactcrist 
expansions of the neural arches in the abdominal re o' . 
are especially well shown. The pelvic fins (ph-)’ W ’ J 
their closely apposed supporting bones, are preser' ed ju 
in advance of the dorsal fin, which is opposed to the ®P 8 ^ 
between the pelvic pair and the anal. The rays of * ^ 
fiorsal fin, probably about 17 in number, are stouter t ! *n 
those of the anal, which seem to have been shorter at 
not less than 30 in number. Of the caudal fin, on J ’ 
fragment remains. Lewi* Co 
P. 9168. Larger and more imperfect specimen, shown of the natnra 
size in PI. XII. fig. 2. The head is vertically crushed 
and seen apparently from above. The postorbital port*'’ 1 
of the cranium is longer than broad, while theinteror 1 
and rostral portions are very slender. The left mandi > u ^ 
ramus is sufficiently complete to indicate that ^ 
quadrate articulation was beneath the hinder border 0 
the orbit. The operculum (op.) is trapezoidal in shap* i 
and slightly crimped postero-superiorly ; an impression ^ 
the right suggests that the preoperculum was m 
expanded : while there arc remains of a suboperci ^ 
and very slender branchiostegal rays on the left. ^ 
vertebra; in the abdominal region bear the expan 
neural arches, and also short, slender ribs. The column 
is distorted just behind the dorsal fin. Imperfect remain 
of all the fins occur, including the large and frinjpnf? 
pointed caudal fin. The squamation is not well preserve^- 
but one longitudinal series of scales near the ven 
border is conspicuous, apparently by its being thickene • 
not enlarged. The latter series doubtless indicates t 1 
course of the luteral line. Lewis Co 
46529. Imperfect specimen, specially displaying the vertebr® and 
pelvic fins. The short and deep vertebral centra are 
marked with delicate longitudinal ridges. The ribs « r 
short and slender, not supported by any transverse pro 
cesses. The laminar neural arches in the hinder two 
thirds of the abdominal region are overlapped by extreme^) 
slender, separate neural spines. Lewis 0 
46560. Distorted fragment, showing robust clavicles, also remains 
of paired and dorsal fins. Lewis Co 
