P YCNODONTIDJE. 
273 
the fish. Vertebral axis at origin of dorsal fin much above the 
middle of the trunk. [Teeth not satisfactorily known.] Dorsal 
and anal fins acuminate in front, rapidly becoming low and 
fringe-like, with distant fin-rays behind ; the dorsal fin with 
53 rays, occupying nearly two-thirds of the back, the anal fin 
with slightly less than 50 rays. Hinder margin of caudal fin 
deeply sinuous. Scales robust on the anterior half of the trunk, 
but extended in more delicate form over the middle of the caudal 
region. 
This species is distorted in such various ways when fossilized, 
that it seems probable the body was less laterally compressed than 
in P. orbiculatum and P. ponsorti. The form of the median fins 
and the extension of the squamation over the caudal region may 
even be regarded as necessitating the removal of the fish from the 
genus Pcilceobalistiim. 
Form. Sf Loc. Upper Cretaceous: Mt. Lebanon, Syria. 
P. 4001, P. 4781. A fine specimen, in counterpart, somewhat 
shortened and deepened by crushing: Hakel, near 
Djebail. The head is much fractured, but exhibits the 
large backwardly-directed process from the hinder margin 
of the cranial roof-bone in the parietal region. The 
expanded neural and haemal arches of the axial skeleton 
of the trunk are distinct: the laminar expansion on the 
neural and haemal spines is confined to their front margin, 
and there is no interlocking. The supports bearing the 
anterior elevated rays of the dorsal and anal fins are 
strengthened by considerable wings. Some of the deli¬ 
cate ribs of the squamation on the middle of the caudal 
region are also preserved. Lewis Coll. 
P. 61, P. 62. Imperfect head and trunk in counterpart, the vomerine 
teeth, as exposed in side view, figured by Davis, loc. cit. 
pi. xxiii. fig. 1 a ; Hakel. Though the skull is displayed 
in side view, it is so much crushed and fractured that it 
does not afford any osteological information of importance. 
The remarkable interlocking of the laminar expansions of 
the neural and haemal spines described below in no. 
P. 4002, is shown by delicate impressions not only in 
the caudal region but also in some of the neural arches 
of the abdominal region. The external bones and scales 
are punctate. Some of the scales are preserved on the 
caudal region, but they do not extend quite to the base of 
the median fins ; they are shown to be quite minute as 
PART III. 
T 
