436 
ACTINOPIERYGir. 
Vomeropsis longispinus (Agassiz). 
1796. Zeus vomer, Q. S. Volta, Ittiolit. Veronese, pi. xxxv. fig- 3 
(errors). 
1796. Zeus triurus, G. S. Volta, ibid. p. clxxxi. pi. xliv. fig. 2 ( errore )• 
1836-44. Vomer lonyisiiinus, L. Agassiz, Poiss. Foss, vol.v. pt. i- PP- 
28, pis. v., vi. 
1854. Vomeropsis longispinus , J. J. Ileckel, Sitzungsb. k. Akad. W 1S3- ' 
math.-naturw. Cl. vol. xi. p. 135. 
Type. Imperfect, partly distorted fish ; Museum of Natural 
History, Paris. 
The type species, attaining a length of about 0'2. Length of 
head with opercular apparatus slightly less than maximum depth of 
trunk, which is contained twice in the total length to the base of 
the caudal fin. Pectoral fin with about 13 rays ; dorsal fin with 
nearly 40 rays, of which the foremost 2 or 3 are rudimentary spines; 
anal fin slightly more extended than the dorsal, arising just in 
advance of the latter, with about 30 rays, of which the foremost 
1 or 2 are rudimentary spines ; caudal fin slightly rounded. 
Form, tj- hoc. Upper Eocene: Monte Bolca, near Verona. 
36200. Imperfect large specimen with traces of scales. 
Purchased, 1861. 
P. 1990. Fine small specimen, in counterpart, labelled by Agassiz. 
The head is well shown, with its great supraoccipital 
crest, small upturned mouth, and traces of minute teeth. 
There are about 8 branchiostegal rays. The vertebra; are 
evidently 10 + 14 in number; the centra are much con- 
stricted, and some show a single sharp lateral keel ; the 
hinder four or five neural spines in the abdominal region 
curve forwards at their upper end. The clavicle is slender 
and sigmoidally bent, with a long rod-like postclavicle 
extending to the ventral border of the fish. The coracoid 
extends downwards to the clavicular symphysis by a 
falciform process from its postoro-inferior angle. The 
pelvic fin-support is somewhat expanded, forked an- 
teriorly, and is in contact with the clavicle at the two 
extremities of this bifurcation. The anterior spine of 
the pelvic fin is very small ; the length of the two (or 
possibly three) next rays equals at least half the depth of 
the- trunk at their insertion; while both theso and the 
succeeding diminutive rays are finely divided distally. Tho 
rays of the dorsal and anal fins are not very satisfactorily 
displayed, but all except two or three anterior rudimentary 
