380 
ACTIXOrTEPvYGII. 
anterior spinous ; paired fins, anal and caudal fins always present. 
Trunk encased in rings of bony plates ; no scales. 
The existing Solenostoma inhabits the Indian Ocean. 
Synopsis of Genera. 
Trunk much compressed, somewhat dilated ; 
pelvic fins opposite anterior dorsal .... Solenostoma (Recent). 
Trunk more elongated, not dilated; pelvic 
tins in advance of anterior dorsal. Solenorhynchus (p. 380). . 
Genus SOLENORHYNCHUS, Heckel. 
[Sitzungsb. k. Akad. Wiss., math.-naturw. Cl. vol. xi. 1854, p. 126.] 
Trunk extremely elongated and slender ; caudal region relatively 
short. Pelvic fins in advance of anterior dorsal; posterior dorsal 
and anal fins similar and directly opposed ; caudal fin very large, 
not forked. Trunk encircled completely in the bony dermal rings. 
Solenorhynchus elegans, Heckel. 
1854. Solenorhynchus elegans, J. J. Heckel, loc. cit. p. 125. 
1868. Solenorhynchus elegans, Kner & Steindachner, Denkschr. k. 
Akad. Wiss., math.-naturw. Cl. vol. xxi. p. 31, pi. v. fig. 1. 
1874. Solenorhynchus elegans, A. de Zigno, Mem. R. Istit. Veneto, 
vol. xviii. p. 297, pi. x. fig. 5. 
Type. Imperfect fish ; Royal Court Museum, Vienna. 
The type species, attaining a length of about 0*1. Head with 
opercular apparatus occupying about one quarter of the total length 
of the fish to the base of the caudal fin. Pelvic fins beneath the 
16th body-ring; anterior dorsal fin with 5 spines, arising behind 
21st ring; posterior dorsal and anal larger, with 17 rays, separated 
from anterior dorsal by 12 rings ; caudal fin with 12 rays. About 
36 body-rings in the abdominal, 9 in the caudal region, provided 
with few small and delicate spines. 
Form. ^ Loc. Upper Eocene: Monte Postale, H. Italy. 
Rot represented in the Collection. 
Family SYNGNATHID^. 
Trunk more or less elongated; snout much produced into a tube, 
and small toothless mouth terminal. Gills tufted, in form of 
rounded lobes; opercular apparatus reduced to operculum; gill- 
opening very small. Pelvic fins absent; one soft dorsal fin; 
