PYCN0D0NT1DJE. 
237 
squamosal (sq.) are obscurely indicated. The position of 
the jaws is shown by remains of the bones and traces 
both of the prehensile and tritoral teeth. The so-called 
ossified sclerotic ( scl .) of the very large eye is also pre¬ 
served, and seems to exhibit a few minute granulations. 
A few of the small polygonal tesserae ( t.) covering the 
cheek can be seen immediately below a fragment of the 
parasphenoid; and the whole of the gular region as far 
back as the clavicle is invested with similar tesserae ( t .) 
bearing sparse tuberculations. A few traces of the cal¬ 
cified gill-filaments (g.f.) remain at the back of the cheek ; 
while the right operculum and preoperculum are exposed 
from the inner aspect. The operculum (op.) is indented 
on the front margin at its point of suspension from the 
hyomandibular; the preoperculum (p.op.) is thickened at 
the upper end and exhibits delicate structural fibres 
radiating from a point at about the middle of its anterior 
margin. Immediately below the preoperculum are two 
branchiostegal rays ( hr .), and in front of these appear 
fragments of bone perhaps of the hyoid arch. The axial 
skeleton of the trunk is well shown and is noteworthy 
for the form of the expansions on the neural ( n.) and 
haemal ( h .) spines of the caudal region. Each expansion 
is triangular, contracting at the base, widening distally, 
and almost—though not quite—confined to the anterior 
margin of the spine. Similar expansions appear to occur 
at least on the hindermost neural spines of the abdominal 
region. The lobe of the pectoral fin (p.) is distinctly 
covered with small thin scales, each ornamented with a 
tubercle; and a cluster of elongated basal cartilages is 
preserved. The lower expansion of the clavicle (cl.) 
terminates in a point at the ventral border of the fish. 
The slender pelvic bones (plv.) are imperfectly shown at 
the base of the fragmentary pelvic fins. The median fins 
exhibit no features worthy of special remark ; but just 
in advance of the origin, of the anal the problematical 
bone (x) marking the posterior limit of the abdominal 
cavity is well displayed. Eine serrations, or acuminate 
tubercles, are observed on the dorsal and ventral ridge- 
scales ; and the courses of both “ lateral lines ” are con¬ 
spicuous. Egerton Coll . 
P. 1619, P. 3768. More imperfect smaller specimen, in counter¬ 
part, displaying the scaly lobe of the pectoral fin and six 
