CHONDROSTEIDJE. 
29 
the short foremost of these being apparently unjointed : 
all the rays beyond the apex are articulated and finely 
branched distally. The anterior pectoral rays are not 
much enlarged, and there are indications of the super¬ 
ficial tubercles on this fin. The pelvic fins appear to be 
slightly deeper than long, and each is supported by a 
regular series of short and stout hour-glass-shaped basals. 
The dorsal fin is opposed to the latter and is shown to 
have been supported by short, stout baseosts and slender, 
elongated axonosts, which taper towards the neural 
arches of the axial skeleton. The anal fin is smaller than 
the dorsal, and its endoskeletal supports are only feebly 
indicated. A series of supports, slender anteriorly, 
becoming shorter and robust behind, is displayed beneath 
the fulcra! scales of the upper caudal lobe; seven scales 
resting upon ten or eleven supports. The caudal fin is 
nearly equilobate. The oat-shaped scales are well- 
preserved on the sides of the upper caudal lobe, smooth 
and flattened externally, tumid on their attached face. 
There is no evidence of other dermal armature; but 
fragments apparently of the skin are preserved in the 
upper half of the abdominal region, and these exhibit a 
series of short double ridges evidently indicating the 
course of the lateral line. Some coprolitic matter occurs 
above the pelvic fins. Enniskillen Coll. 
P. 2047. Imperfect small individual, originally about 0-42 in length. 
Egerton Coll. 
38545. Imperfect small individual, about 0-56 in length, showing 
portions of all the fins. Purchased , 1864. 
P. 3367. Slightly larger specimen, with imperfectly preserved tail, 
wanting the anal fin. The maxillary and pterygoid bones 
are described and figured by Traquair, loc. cit. p. 254, fig. 4, 
and re-drawn of the natural size in PI. I. fig. 3 of the 
present volume. The left operculum and suboperculum 
are also shown, and the pectoral fins are especially well- 
preserved ; most of the rays of these fins exhibit a 
longitudinal series of tubercles fused with their basal half. 
Enniskillen Coll. 
P. 2050. Remains of head and abdominal region, exhibiting the 
form of the clavicle, and displaying a long series of 
neural arches with their loosely apposed neural spines. A 
