33S 
ACTIXOPTERYGIl. 
the tail, saggestive of a separate caudal fin, of which a 
few rays remain. The characteristic intermuscular bones 
are exhibited dorsally throughout the trunk, and below 
the vertebral axis in the caudal region. The limestone 
is stained by the fossil, but there are no traces of 
scales. Lewis Coll. 
P. 4751. Larger but more imperfect and distorted specimen, dis¬ 
playing parts of the head, pectoral arch, pectoral fin, and 
scales (PI. XYIII. fig. 2). The stout supraoccipital bone 
of the skull (s.occ.) projects considerably backwards, and 
the rostrum is slender. The length of the cranium, 
indeed, appears to be more than three times as great as 
its width at the occiput. The right mandibular ramus is 
shown {md.), rising to a low coronoid process immediately 
behind its toothed portion. The clustered teeth are very 
stout and blunt. The vertebrae behind the head are 
exposed from above, but the neural spines are broken 
away from the much expanded arches. There are im¬ 
pressions of some of the short ribs ; while a few of the 
pointed transverse processes are preserved in the hinder 
part of the abdominal region. The tail is much distorted 
and too imperfect for description. The clavicles (cl.) are 
seen immediately behind the head, one of them displaying 
its slender, arched form, with tapering upper end. One 
of the pectoral fins {pet.) is also preserved, though a little 
distorted and imperfect distally. Behind this, the brownish 
impression of the soft parts of the fish is curiously 
mottled, as if there were indications of small, rudimentary 
quadrangular scales. Further back, the course of part 
of the intestine is marked by its phosphatic contents. 
Lewis Coll. 
P. 4030. More imperfect small specimen, much distorted, showing 
the obtuse teeth. Lewis Coll. 
48150. Portion of very small eel, probably young of this species. 
Lewis Coll. 
Urenchelys hakelensis (Davis). 
[Plate XYIII. fig. 3.] 
1887. Anguilla hakelensis, J. W. Davis, Trans. Roy. Dublin Soc. [2] 
vol. iii. p. 626, pi. xx. fig. 3. 
Type. Nearly complete fish; British Museum. 
