374 
ACTIXOPTERTGII? 
Genus FISTULARIA, Linnaeus, 
[Syst. Nat. ed. 10, 1758, p. 312.] 
Teeth minute. Vertebrae very numerous, between 70 and 90 io 
total number, less than half being caudal. Pectoral fins on flank ; 
infraclavicles much extended, and small pelvic fins inserted not far 
behind them ; no free spines in front of dorsal fin, which is remote ; 
anal fin similar to dorsal; caudal fin forked, with few much 
elongated median rays. Scales absent, but a series of rudimentary 
bony scutes along the lateral line and the median dorsal line. 
Existing species occur on the shores of the Indian Ocean and of 
the tropical region of the Atlantic Ocean. 
A figure of the skeleton of the existing F. tahaccaria is given by 
Agassiz, Poiss. Foss. vol. iv. pi. xxxv. fig. 1 (wrongly labelled 
Avilostoma chinense). 
Fistularia koenigi, Agassiz. 
1830-42. Fistularia koenigii, L. Agassiz, Poiss. Foss. vol. iv. p. 279, 
pi. xxxv. flg. 5. 
1859. Fistularia koenigii, G. vom Rath, Zeitschr. deutsch. geol. Ges. 
vol. xi. p. 124, pi. V. fig. 2. 
1886. Fistularia koenigi, A. AVettstein, Fischfaima Tertiaer. Glarner- 
schief, (Denkschr. schweiz. Pal. Ges. vol. xiii.), p. 92. 
Imperfect head and abdominal region ; British Museum. 
An imperfectly known species, attaining a length of about 0‘6. 
Cranial roof with three finely denticulated longitudinal ridges, the 
median the largest; opercular apparatus ornamented with radiating 
series of minute tubercles, and ridge of preoperculiim with a series 
of conspicuous denticles. Vertebrse about 74 in total number, of 
which 30 are caudal; length of fused anterior vertebrae approxi¬ 
mately one fifth of the column. Dorsal and anal fins with 11 or 
12 rays ; two elongated median caudal rays. 
Form. ^ Log. Oligocene: Glarus, Switzerland. 
P. 9236. Type specimen, in counterpart, described and figured by 
Agassiz, loc. cit.; Engi. Old Collection. 
P. 1975 a. Obscure remains of head and anterior vertebrae, labelled 
by Agassiz and mentioned loc. cit .; Engi. Egerton Coll. 
P. 1975, P. 4000. Scattered remains of small specimen, in counter¬ 
part ; Engi. The cranial roof is shown. 
Egerton ^ Enniskillen Colls* 
