362 MEMOIRS OF THE CARNEGIE MUSEUM. 



variable; dorsal fin elongated, usually extending at least half of the length of the 

 trunk. Scales rhombic." (A. S. Woodward, /. c, Pt. Ill, p. 163). 



Genus Ophiopsis Agassiz. 

 "Trunk much elongated, gradually tapering from the occiput backwards or 

 the dorsal margin only slightlj^ arcuate; head large or of moderate size. Marginal 

 teeth acutely pointed. Notochord invested with delicate ring-vertebrse; ribs 

 ossified. Bifurcation of dorsal fin-rays variable; fulcra often absent on paired fins 

 and usually confined to the base of the median fins. Paired fins relatively large; 

 dorsal fin ordinarily e.xtending about half the length of the back, high in front, 

 low behind; anal fin small; caudal fin forked. Scales covering the whole of the 

 trunk, in regular series, united by peg-and-socket articulation, and often pectinated 

 at the hinder border; the scales at the middle of the flank scarcely deeper than broad, 

 few of the ventral scales much broader than deep; no enlarged ridge-scales." (A. 

 S. Woodward, I. c, Pt. Ill, p. 165-6). 



5. Ophiopsis attenuata Wagner. 

 1863. Ophiopsis attenuata A. Wagner. 



Abhandl. K. Bay. Akad. Wiss., Math.-Phys. CL, Vol. IX, p. 655. 

 1873. Ophiopsis attenuata Thiolliere. 



Poiss. Foss. Bugey, Pt. II, p. 19; pi. VIII, fig. 2. 

 1895. Ophiopsis attenuata A. S. Woodward. 



Cat. Foss. Fishes Brit. Mus., Pt. Ill, p. 167; pi. Ill, figs. 2, 3. 



Type. — Trunk of fish; Paleontological Museum, Munich. 



A species attaining a length of about 15 cm. Length of head with opercular 

 apparatus equalling the maximum depth of the trunk, and contained about five 

 times in the total length of the fish; maximum depth of trunk twice as great as the 

 width of the caudal pedicle. External head-bones and opercular bones smooth. 

 Dorsal fin occupying about one-half of the length of the back, the length of the 

 dorsal fin-rays rapidly decreasing in a posterior direction, and most of them un- 

 divided. Scales delicately serrated, not pectinated. 



This species is represented in the Carnegie Museum by two average-sized and 

 tolerably well-preserved individuals, cataloged under the numbers 4041 and 4422. 



6. Ophiopsis guigardi Thiolliere. 

 1873. Ophiopsis guigardi Thiolliere. 



Poiss. Foss. Bugey, Pt. II, pi. VII (figure only). 



