TRACHINID.S. 
589 
Family TRACHINID/E. 
As Gobiidae, but gill-opening wide, pelvic fins never united, and 
most of the abdominal vertebrae without transverse processes. 
Small fishes living at the bottom on nearly all coasts, some- 
times ranging into the deep sea. There are no extinct genera of 
importance. 
Genus CALLIPTERYX, Agassiz. 
[Poiss. Foss. vol. iv. 1838, p. 12.] 
Eye apparently lateral ; teeth minute and clustered. Vertebrae 
10 in the abdominal, 14 in the caudal region. Dorsal fins con- 
tinuous, the anterior portion comprising about 9 very short spines ; 
anal fin less extended than posterior dorsal ; caudal fin rounded. 
Scales very small or absent. 
An extinct genus known only by two species from the marine 
U pper Eocene of Italy. 
Callipteryx speciosus, Agassiz. 
1796. Oadus merluccius, G. S. Volta, Ittiolit. Veronese, p. Ixxii. pi. xv. 
(errore). 
1835. Callipteryx speciosus, L. Agassiz, Neues Jahrb. p. 293 (name only). 
1838-42. Callipteryx speciosus, L. Agassiz, Poiss. Foss. vol. iv. pp. 12, 
196, pi. xxxiii. fig. 1. 
Type. Imperfect fish ; Paris Museum of Natural History. 
The type species, attaining a length of about 0-7. Maximum 
depth of trunk much exceeding half length of head with opercular 
apparatus, which is contained less than four times in the total 
length of the fish to the base of the caudal fin. 
Form. <Sf Loc. Upper Eocene : Monte Bolca, near Verona. 
Not represented in the Collection. 
Callipteryx recticaudus, Agassiz. 
1796. Triyla lyra, G. S. Volta, Ittiolit. Veronese, p. cxxxi. pi. xxx. 
(errore). 
1835. Callipteryx recticaudus, L. Agassiz, Neues Jahrb. p. 300 (name 
only). 
1838—42. Callipteryx recticaudus, L. Agassiz, Poiss. Foss. vol. iv. pp. 12, 
198, pi. xxxiii. fig. 2. 
Type. Imperfect distorted fish ; Paris Museum of Natural History. 
A smaller and more slender species than the type, attaining a 
