592 Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 
triangular bone, and consists of eight rays, which dichotomize repeatedly ; they 
are 0°5 of an inch in length. 
It is unfortunate that the anterior portion of the head should be wanting; but 
though the characteristic teeth are not present, there appears to be little doubt 
that the parts preserved clearly indicate that the species should be located in the 
genus Spaniodon. 
This specimen is from the hard limestone of Hakel. All the species of 
Spaniodon hitherto described have been found at Sahel Alma, so that with this 
specimen the horizon for the genus is extended to both localities. It is remarkable 
for its elongated form, and in this respect much resembles Spaniodon elongatus, 
Pictet. This resemblance, however, is only superficial; the two may be readily 
distinguished by the vertebral column of the latter, consisting of fifty-eight 
vertebrae, whilst the specimen now described has only forty-four vertebre. It 
is proposed to distinguish this species as Spaniodon hakelensis. 
Formation and Locality.—Hard chalk: Hakel, Mount Lebanon. 
Lx coll_—Professor Lewis Collection; R. Damon, Esq., Weymouth. 
Spaniodon brevis, Picter and Humperr. 
(Pl. xxxty5, fig. 1.) 
Clupea lata. Picrrr, F. J., 1850. ‘‘ Dese. des quelques poiss. fossiles du Mt. 
Liban.,” p. 87, pl. vu, fig. 1. (Non Clupea lata, Agassiz.) 
Spaniodon brevis. Picrer et Humpert, 1866. ‘Nouv. rech. s. les poissons 
fossiles du M. Liban.,” p. 86, pl. x11, figs. 3, 4. 
The examples of this species, described by MM. Pictet and Humbert, are 
somewhat imperfect, part of both head and tail being absent; for this reason it 
appears to be desirable that a more perfect specimen should be figured. The 
description of the vertebral column and its apophyses, and the dorsal, anal, 
and paired fins are well given by the authors cited above. The caudal fin is 
deeply cleft, and the lower lobe considerably longer than the upper one; the 
outer and longer rays of each are strong, and are also supported by imbricating 
rudimentary rays; they are transversely jointed and dichotomize; the median 
rays are short, and divided towards their extremity. 
The entire length of the body to the base of the tail is 4:1 inches; to this must 
be added 1°83 for the tail; the greatest height in front of the dorsal fin is 1:1 inch; 
the head, from the tip of the snout to the posterior margin of the gill-cover, 
is 1:7 inch; its height 1:1 inch. The head is slightly twisted so as to expose 
the under surface; the orbit is high, and well advanced towards the snout; the 
opercular bones are large and rounded; about a dozen branchiostegal rays are 
