376 
ACTIN0PTERYG1I. 
A small species, attaining a length of about 018. Length of 
head with opercular apparatus somewhat less than half that of the 
trunk from the pectoral arch to the haso of the caudal fin. Vertebrae 
about 50 in number. Pelvic fins inserted nearer to the anal 
than to the pectorals ; dorsal and anal fins comparatively short- 
based, apparently with not more than 17 and 15 rays respectively ; 
anal arising nearer to the caudal than to the pelvic fins. 
I'orm. Loc. Upper Eocene: Monte Bolca, near Verona. 
P- 1976, P. 4119. Imperfect small specimen, in counterpart, 
showing most of the principal characters of the genus and 
species ; wrongly labelled Fistularia tenuirostris by 
Agassiz. Egerton 6f Enniskillen Colls. 
The following species, known only by a fragment, has also been 
ascribed to this genus, but is not represented in the Collection : ■ 
Aulostoma liccitce, H. E. Sauvage, Ann. Sei. Geol. vol. xi. art. no. 3 
(1880), p. 33. — Upper Miocene ; Licata, Sicily. [Head, 
&c.] 
Genus UROSPHEN, Agassiz. 
[Poiss. Foss. vol. iv. 1844, p. 284.] 
Teeth minute. Vertebrae between 50 and 60 in number. Anal 
fin similar and opposed to remote soft dorsal ; caudal fin relatively 
very large. Scales absent. 
Urosphen dubia (Blainville). 
1796. Fistularia tabacaria, G. S. Volta, Ittiolit. Veronese, p- exxx. 
pi. xxix. fig. 4 (errors). 
1818. Fistularia dubia, II. I). de Blainville, Nouv. Diet. d’Hxst. A* 1 • 
vol. xxvii. p. 341. 
1835. Urosphen fist u laris, L. Agassiz, Neues .Tahrb.p. 293 (name onl} )■ 
1839-42. Urosphen fistularia, L. Agassiz, Poiss. Foss. vol. iv. p. > 
pi. xxxv. fig. 6. 
1876. Urosphen fistularia, F. Bassani, Atti Soc. Veneto-Trent. Sci. I' 0, • 
vol. iii. p. 182. 
Type. Imperfect fish ; Museum of Natural History, Paris. 
The type species, attaining a length of about 0-45, the head in 
such a specimen measuring O' 135, the vertebral column 0'199, ® n 
the caudal fin 0'118 in length. Dorsal and anal fins probabl) vlt 
about 20 rays. 
Form. <Sf Log. Upper Eoceno : Monte Bolca, near \ erona. 
Not represented in the Collection. 
