466 
ACTlNOrXEEYGir. 
and uniform or rudimentary, scarcely enlarged or compacted in the 
pectoral region. 
The existing species are large fishes of the tropical Atlantic and 
Indian Oceans. 
Cybium speciosum^ Agassiz. 
1796. Scomber speciosus, G. S. Volta, Ittiolit. Veronese, p. clxix, pi. xli. 
{errore). 
1818. Scomber speciosus {?), 11. D. de Blainville, Nouv. Diet. dTIist. 
Nat. vol. xxvii. p. 346. 
1835. Cybium speciosum, L. Agassiz, Neues Jabrb, p. 293. 
1835-44. Cybium speciosum, L. Agassiz, Poiss. Foss. vol. v. pt. i. p. 61, 
pi. XXV. 
Type. Imperfect fish; Museum of Natural History, Paris. 
A small species, attaining a length of about 0‘35. Length of 
head with opercular apparatus somewhat exceeding maximum 
depth of trunk, and slightly less than one third the total length of 
the fish to the base of the caudal fin. Teeth slender. Vertebrae 
15 in the abdominal, 15 in the caudal region. Posterior dorsal 
and anal fins apparently with 10 articulated rays followed by 
8 finlets. 
This imperfectly known species differs remarkably from the 
existing C. maculatum in the number of vertebrae, the latter having 
45. The number of vertebrae is not recorded in other species. 
Form. ^ Log. Upper Eocene : Monte Bolca, near Verona. 
P. 1989, P. 4133. Small specimen, in counterpart. 
Egerton EanisTcillen Colls. 
Cybmm bleekeri (Winkler). 
1876. Enchodus bleekeri, T. C. Winkler, Archiv. Mus. Teyler, vol. iv. 
p. 43, pi. ii. figs. 24, 25. 
1891. Cybium (?) sp., A. S. Woodward, Geol. Mag. [3] vol. viii. 
p. i09. 
1892. Cybium bleekeri, R. Storms, Bull. Soc. Beige Geol. vol. vi. Mem. 
p. 3, pi. i. 
Type. Teeth. 
A large imperfectly known species, with skull about 0-16 in 
length. Teeth broad and much laterally compressed, nearly uniform 
in size in premaxilla. Anterior end of premaxilla shaped as in 
C. excelsum (fig. 15 a) ; dentary more contracted at symphysis. 
Form, Log. Middle Eocene : Belgium. 
P. 5923. Six teeth ; Bruxellian, Woluwe St. Lambert, Brussels. 
Presented by Monsieur A. Houzeau de Lehaie, 1889. 
