280 
ACTINOPXEEYGII. 
Synopsis of Genera. 
Pelvic fins excessively enlarged : caudal forked; 
no dermal scutes . Chirothrix (p. 280). 
Pectoral fins larger than pelvic pair; caudal 
forked; dorsal dermal scutes . Telepholis 28^). 
Pectoral fins larger than pelvic pair; caudal 
rounded; ? no dermal scutes . Exocoetoides (p. 286). 
Genus CHIROTHRIX, Pictet & Humbert. ^ ^ 
[Nouv. Eechf^Poiss. Poss. Mt. Liban, 1866, p. 51.] 
Syn. Megapus, C. Schliiter, Palaeontogr. vol. xv. 1868, p. 276. 
Megistopus, H. Landois, Neues Jahrb. 1894, vol. ii. p. 234. 
Head relatively large and jaws apparently toothless ; the large 
branchiostegal rays 8 or 9 in number. Vertebrae between 50 and 
60 in number, about 25 being caudal. Pin-rays mostly divided as 
well as articulated distally. Pectoral fins arising near the ventral 
border, delicate and much smaller than the pelvic pair, with only 
one ray considerably elongated; pelvic fins very large, with much 
expanded pelvic bones, close to the pectoral pair ; dorsal fin arising 
immediately behind the head, and occupying less than half of the 
back; caudal fin forked. No dermal scutes. 
Chirothrix libanicus, Pictet & Humbert. 
[Text-figure 10.] 
1866. Cheirothrix lihanicus, Pictet & Humbert, Noiiv. Rech. Poiss. 
Poss. Mt. Liban, p. 52, pi. v. fig. 1. 
1868. Megapus, C. Schliiter, Palaeontogr. vol. xv. p. 275. 
1882. Cheirothrix lihanicus, P. Bassani, Denkschr. k. Akad.Wiss., math.- 
naturw. Cl. vol. xlv. p. 273. 
1887. Cheirothrix lihanicus, J. W. Davis, Trans. Hoy. Dublin Soc. [2] 
vol. hi. p. 527, pi. xxvi. figs. 3, 4. 
1888. Cheirothrix lihanicus, K. A. von Zittel, Handb. Palaeont. vol. hi. 
p. 311, fig. 319. 
Type. Imperfect fish ; Geneva Museum. 
The type species, attaining a length of about 0*11. Length of 
head with opercular apparatus equalling twice the maximum depth 
of the trunk, and half its length from the pectoral arch to the base 
of the caudal fin. Pectoral fins with about 13 delicate bifurcating 
rays, decreasing in length both forwards and backwards, the fifth 
being excessively elongated; pelvic fins comprising about 17 rays, 
the longest reaching the caudal fin wLen adpressed to the trunk ; 
dorsal fin, with 16 rays, much elevated, the length of the longest 
