588 Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 
sub-triangular in outline, with the apex upwards; their constituent elements 
cannot be easily recognized in this specimen. ‘The tympanic area is large. 
Of the spinal column Professor Pictet states that he counted about forty-seven 
vertebrae, of which twenty were caudal. In the specimen now described there 
are fifty-seven vertebrae, and of these twenty are caudal. The discrepancy, no 
doubt, arises from the imperfection of the examples which served as types to 
Professor Pictet. The vertebrae are slightly broader than high, small, and 
contracted in the middle; the hemal and neural apophyses are deeply forked, 
numerous, long, and slender. Sixteen interneural apophyses support the dorsal 
fin, and an equal number of interhzmals that of the anal. The ribs are numerous, 
long, and slender; attached to them are branching ribs, or pleurapophyses, 
extending more or less horizontally backwards. 
The dorsal fin is supported by sixteen rays, is moderate in size, its base 
extending 0:7 inch; it is equidistant between the posterior margin of the head 
and the base of the tail. The anal fin is also composed of sixteen rays, shorter 
and less robust than those of the dorsal; it is situated almost in contact with 
the caudal, the anterior ray only 0°7 inch from its base. The caudal fin is 
deeply bilobate, the lower lobe the larger; the outer rays of each are strong, 
jointed, and towards the distal extremity dichotomized; they are supported by 
rudimentary rays. The bases of the short median rays are expanded and simple, 
attached to the rather widely expanded hypural bones. 
The pectoral fins are situated near the abdominal surface; they are strong, 
especially the anterior rays, and about 0°8 inch in length. The number of rays 
in this specimen is not shown. The ventral fins are considerably smaller than 
the pectorals; they are placed in arrear of the posterior rays of the dorsal, 
and supported by a pair of pubic bones, joined together on the median 
abdominal line. 
Small patches of the scales are preserved, but they are too fragmentary 
to afford information even as to their size or form. 
Formation and Locality.—Soft chalk: Sahel Alma, Mount Lebanon. 
Ez coll.—Lewis Collection; R. Damon, Esq., Weymouth. 
Spaniodon elongatus, PicTer. 
Spaniodon elongatus, Picrer, 1850. ‘Desc. de quelques poiss. foss. du M. 
Liban.,” p. 35, pl. x1, figs. 1, 2. 
Spaniodon elongatus. Picrer et Humperr, 1866. ‘ Nouv. rech. s. 1. poiss. foss. 
du M. Liban.,” p. 89, pl. v1., figs. 1, 2. 
This species is distinguished by its great length in proportion to its height, 
the former being ten to one of the latter. The number of the constituent 
