'590 
ACTIN’OPTKRYGII. 
length of about 0 4 45. Maximum depth of trunk about half the 
length of the head with opercular apparatus, which is contained 
between three and a half and four times in the total length of the 
iish to the base of the caudal fin. Dorsal fin with 8 very short and 
stout, finely striated spines, then a more slender and slightly longer 
spine, then 30 articulated and divided rays, most of which are at 
least twice as long as the spines ; anal fin with one or two feeble 
small spines and 20 articulated and divided rays, the fin terminating 
behind opposite the end of the dorsal. 
Form. 6[ Loo. Upper Eocene : Monte Bolca. 
P. 9477. Fine specimen 0 - 25 in length, in counterpart, with crushed 
and imperfect head hut otherwise displaying all the 
principal generic and specific characters. 
History unknown. 
The following extinct species have been ascribed to the existing 
genus Trachinus, hut are not represented in the Collection : — 
Trachinus dracunculus, J. J. Deckel, Ncues Jahrb. 1849, p. 500 
(name only) ; D. 0. Kramberger, Beitr. Palaont. Oesterr.- 
Ungarns, vol. ii. (1882), p. Ill, pi. xxii. figs. 3, 4. 
Upper Miocene; lladoboj, Croatia. [Imperfect fish; 
Imperial Geological Survey, Vienna.] 
Otolithus ( Trachini ) laevigatug, E. Kokcn, Zeitschr. deutsch. ge°l- 
Ges. vol. xl. (1888), p. 286, pi. xviii. figs. 13, 14. — Lower 
Tertiary; Jackson Kiver, Mississippi. [Otolith.] 
Otolithus ( Trachini ) mutabilis, E. Koken, loc. cit. vol. xliii. (1891 ), 
p. 112. Otolithus hiscissus , E. Koken, loc. cit. vol. xxxvi. 
(1884), p. 553, pi. xi. fig. 9.— Middle and Upper Oligocene; 
Germany. [Otolith.] 
Otolithus ( Trachini ) seelandicus, E. Koken, Abh. phys. Cl. k. Ges. 
Wiss. Gottingen, vol. xxxii. (1885), p. 115, pi. v. fig- 25, 
and Zeitschr. deutsch. geol. Ges. vol. xliii. (1891), p- * 
figs. 8, 9. — Lower Eocene ; Copenhagen. [Otolith.] 
Otolithus ( Trachini ) verus, E. Koken, loc. cit. 1891, p. 1 13, I>1- x " 
figs. 13, 14. — Upper Oligocene; Cassel. [Otolith.] 
Supposed fragments of skull of tho existing genus Uranoscopus, 
from the Lower Pliocene of Orciano, Tuscany, are named Uranoscopus 
peruzzii by 11. Lawley, Nuovi Studi Pesci, etc., Colline Toscano 
(1876), p. 64. 
The following imperfectly known extinct genera and species have 
also been referred to the Trachinidoe, but arc not represented in the 
Collection : — 
