596 
ACTINOPTEKYGIl. 
Type. Imperfect fish ; Paris Museum of Natural History. 
The type species, attaining a length of about 005. Length of head 
with opercular apparatus equalling maximum depth of trunk and 
somewhat less than one third total length of fish to base of caudal 
fin. Separate dorsal fin-spine about twice as long as the next, the 
length of which slightly exceeds depth of trunk at its insertion; 
continuous dorsal fin with 9 spines and 9 articulated rays ; anal fin 
with 3 spines and 7 articulated rays. 
Form. 4' Loc. Upper Eocene : Monte Bolca, near Verona. 
P. 653. Fine specimen 0-025 in length, noticed by Agassiz, op. cif- 
vol. iv. p. 192. Eyerton Coll. 
P. 652, P. 3948. More imperfect larger specimen, in counterpart, 
showing characteristic squamation. 
Egerton 4" Enniskillen Colls. 
As noticed by Agassiz, the following fragmentary specimens bear 
some resomblance to the skull of the existing genus Anarrhichas, but 
they exhibit too many differences to be definitely ascribed to the 
family Blenniidse : — 
P. 620. Imperfoct occipital portion of cranium, with remains of 
opercular apparatus, mandibular suspensorium, and arti- 
cular end of mandible, intended to be the type specimen of 
Laparus alticeps, Agassiz, recorded by name only in Bep- 
Brit. Assoc. 1844 (1845), p. 308 ; London Clay, Sheppey. 
The hinder portion of the dentary bone shows the bases o 
a single close series of very small teeth. Egerton Coll. 
P. 6479. Less incomplete head of larger fish apparently of same 
species ; London Clay, Sheppey. The jaws are imperfect, 
and the dentition is not seen. The opercular apparatus is 
much larger than in Anarrhichas. Beclcles C oil , 
P. 9478. Occipital portions of two nearly similar crania ; London 
Clay, Sheppey. Egerton Col ■ 
A tooth apparently of the existing Anarrhichas lupus, from the 
Coralline Crag of Gedgravo, Suffolk (Museum of Practical Geolog} )r 
is described by E. T. Newton, Vert. Pliocene Hep. Britain (Mem- 
Geol. Surv. 1891), p. 91, pi. x. fig. 4. 
The following extinct species, not represented in the Collection, 
have been referred to existing genera of this family : — 
Blennius fossilis, D. G. Kramberger, Bad Jugoslav. Akad. vol. 
