0LIG0PLEURIDJ2. 
495 
long as deep, and the side of each exhibiting a median longitudinal 
ridge with a deep pit above and below ; ribs robust, but short. 
Pin-rays robust, all closely articulated and divided at some distance 
from the base ; fulcra conspicuous on the median tins. Dorsal and 
anal fins short-based, the former almost or completely in advance of 
the latter; caudal tin much forked. Scales large. 
,, ? Oeonoscopus petraroisgj Costa. 
' 
1853. lonoscopus petraroice, 0. G. Costa, Ittiol. Foss. Ital. p. 2, pi. i. 
1864. Oeonoscopus petraroice , 0. G. Costa, Atti Accad. Pontan. vol. viii. 
p. 59, pi. viii. 
1882. Oeonoscopus petraroice , F. Bassani, Denkschr. k. Akad. Wiss., 
math.-naturw. Cl. vol. xlv. p. 240. 
Type. Imperfect fish; Geological Museum, University of Naples. 
The type species, attaining a length of about 0*7, known only by 
a fragmentary specimen which seems to have a somewhat deeper 
abdominal region than the next species, also differing from the 
latter in the stouter teeth and slightly more forward position of the 
dorsal fin. 
Form. Sf Log. Cretaceous: Pietraroja, Province of Benevento, 
Italy. 
Not represented in the Collection. 
The original specimen at Naples is covered with large cycloidal 
scales, and these are ornamented in the exposed portion with deli¬ 
cate, parallel horizontal lines, which sometimes , seem to terminate at 
the hinder margin in fine serrations. The teeth are, as shown by 
Costa, enamelled at the tip ; but the crimping of the crown of the 
two hinder teeth is not quite so conspicuous as indicated in Costa’s 
figure. The operculum is much deeper than broad, and the bran- 
chiostegal rays are slender. The dorsal fin exhibits biserial fulcra, 
and all the other fins are seen to be fulcrated, except the pectorals, 
which are too much crushed. The dorsal fin exhibits at least 24, 
while the anal has only about 12 supports. 
Oeonoscopus cyprinoides (Wagner). 
1863. Oligopleurus cyprinoides, A. Wagner, Abh. k. bay. Akad. Wiss., 
math.-phys. Cl. vol. ix. p. 721, pi. vi, 
1887. Oenoscopus cyprinoides [misprinted esocinus], K. A. von Zittel, 
Handb. Pakeont. vol. iii. p. 232. 
Type. Fish, wanting head ; Palaeontological Museum, Munich. 
A species nearly as large as the type. Length of head with 
opercular apparatus nearly equal to the maximum depth of the 
