182 
ACTINOPTERYGIT. 
from the pectoral arch to the base of the caudal tin, and exceeding 
twice the width of the caudal pedicle. Suborbitals subdivided into 
small hexagonal plates, ornamented with granulations. Dorsal 
fin comprising more than 45 rays, its anterior portion elevated and 
as deep as the trunk at its point of origin. Principal flank-scales 
deeper than broad, smooth, and very finely denticulated on the 
posterior border. ( Pictet .) 
Form. <Sf Loc. Upper Cretaceous : Mount Lebanon, Syria. 
Not represented in the Collection. 
P«%al©pteryx dorsalis^ Davis^ 
1887. Petalopteryx dorsalis , J. W. Davis, Trans. Roy. Dublin Soc. [2] 
vol. iii. p. 627, pi. xx. fig. 4. 
Type. Fish with imperfect fins; British Museum. 
A small species, attaining a length of 0*075. Length of head 
with opercular apparatus exceeding the maximum depth and con¬ 
tained six times in the total length of the fish to the base of the 
caudal fin; maximum depth of trunk contained nearly six times in 
its length from the pectoral arch to the base of the caudal fin, and 
twice as great as the width of the caudal pedicle. Tesserae on 
cheek very small, elongated antero-posteriorly, and smooth. [Fins 
imperfectly known, but] pelvic pair comprised within the first third 
of the trunk. Scales very small and irregular, all apparently at 
least as broad as deep, smooth, and not serrated on the posterior 
margin. 
Form. Sf Loc. Upper Cretaceous: Mount Lebanon, Syria. 
P. 4755. Type specimen described and figured by Davis, loc. cit.: 
Hakel. The lower dentition and the cheek-plates are 
especially well shown in the head; the branchiostegal 
rays are robust though filiform. There is no evidence as 
to the nature of the vertebral axis, owing to the thickness 
of the squamation. The fins are too imperfect for de¬ 
scription, and it is impossible to determine whether or 
not the anal is wanting by accident. The caudal fin-rays 
distinctly bifurcate once. Except in the posterior half of 
the caudal region, there is evidence of the dichotomy of 
the vertical series of scales both dorsally and ventrally; 
and, as noted by Davis, some of the small scales near the 
pectoral fins appear to be rounded. Lewis Coll. 
