270 
ACTINOPTERYGII. 
into two short median spines, both smooth and the first half as long 
as the second. 
Form. Sf Loc. Upper Senonian : Mount Lebanon, Syria. 
39239. The type specimen described and figured by Davis, Joe. cit .; 
probably from Hakel. Part of the anterior half of the 
fish is wanting, and the remainder is so much crushed 
and distorted that no elements are distinctly recognizable. 
Two bodies in the abdominal region might be interpreted 
as ring-vertebrse, but they are probably only the expanded 
haemal arches; and there are no traces of ossifications in 
the notochordal sheath in the caudal region. Owing to 
the partial absence of the squamation in the latter region, 
the neural and haemal spines are exposed; they seem to 
bear the characteristic laminar expansion on their anterior 
border. The pelvic fins are well-developed and comprise 
considerably elongated stout rays, which do not appear 
to bifurcate, but are articulated at moderately wide 
intervals in their distal two-thirds. The dorsal and anal 
fins consist of similar rays, and the two laterally-apposed 
halves of each are so readily separable, that they are 
mostly displaced in the fossil and produce the false im¬ 
pression of more fin-rays than supports. Most of these 
supports are widened with little “ wings.’’ Of the caudal 
fin only part of the lower lobe is preserved; it exhibits 
three or four slender fulcral rays at its origin. Some of 
the scales of the right side are displayed from the outer 
aspect, and there are also good impressions of the external 
face of those of the left side. Their form and ornamen¬ 
tation are noted in the diagnosis, and it is unfortunate 
that the nature of their attached face cannot be deter¬ 
mined. The very large ridge-scute shortly in advance 
of the pelvic fins has already been remarked upon by 
Davis; and there can be no doubt that the two smooth 
spines at the origin of the anal fin are fixed either on one 
or two of the scutes of the ventral ridge-series. 
Tristram Coll. 
Genus PALiEOBALISTUM, Blainville. 
[Nouv. Diet. d’Hist. Nat. vol. xxvii', 1818, p. 338.] 
Trunk discoidal, not produced at the caudal pedicle. Head and 
opercular bones externally granulated or rugose ; teeth smooth, 
sometimes feebly indented; vomerine teeth arranged in five regular 
