402 
ACTIXOPTERYGII. 
laterally compressed by accidental crushing. A sclerotic 
ring, showing some traces of rugosity, lies in the matrix 
beneath the fossil. The mandible wants its hinder 
extremity, and only the bases of the larger teeth remain. 
The outer face of the anterior end of the dentary is very 
coarsely rugose, and the symphysis is somewhat expanded 
for the sockets of the three anteriorly-directed large teeth. 
Of the latter on the left side the uppermost socket appears 
to be almost obliterated. There is no suture between the 
symphysial end and the remainder of the dentary bone, 
but it exhibits its usual slight constriction where flanking 
the splenial, and the oral border is toothless until a point 
considerably behind the dentigerous portion of the inner 
element. The teeth of its single, moderately spaced series 
are small and nearly equal in size, a diminution being 
shown only in the foremost five or six ; the hindermost 
teeth, however, are not preserved. The middle portion of 
the dentary is about one-third deeper than its symphysial 
end, much thinner, and with the inferior margin slightly 
turning inwards. The splenials evidently enter the sym¬ 
physis, but pyrites obscures their anterior end. Viewed 
from above each is lenticular in form, though produced in 
a very long and slender extension posteriorly; and the 
thickest portion on the left side exhibits the bases of two 
large teeth besides one small anterior tooth, while the 
corresponding part on the right side seems to indicate a 
diseased state of the bone. Fragments of other elements 
are displaced between the mandibular rami, but it is 
impossible to determine them. Enniskillen Coll. 
P. 5651. Fragments of skull in a block of chalk; Cuxton, Kent. 
A portion of the flattened cranial roof is rugose on the 
external surface, but affords no clue to the arrangement 
and limits of the elements. The imperfect parasphenoid 
is exposed from the inner aspect, showing the very robust 
though narrow bar beneath the orbit, and the much- 
extended laminar basipterygoid processes. There is also 
a fragment of a premaxilla with one tooth. 
Harford Coll. 
P. 5630. Fine rostrum, much fractured but displaying the super¬ 
ficial rugose ornament and the bases of the vomerine 
teeth, and apparently not distorted by crushing ; Kent. 
A side view of this fossil is given in outline, of one-half 
