30 
ACTIl^’OPTERYGII. 
Rhacolepis buccalis, Agassiz. 
1831. Figure by Spix & Martins, Reise in Brasiiieii, Atlas, pi. xxii. 
fig'- . 
1841. Phacolepis buccalis, L. Agassiz, Edinb. New Phil. Joiirn. 
vol. XXX. p. 83. 
1844. Rhacolepis buccalis, L. Agassiz, Comptes Rendus, vol. xviii. 
p. 1011, and Poiss. Foss. vol. iv. p. 293. 
1887. Rhacolepis buccalis, A. S. Woodward, Proc. Zool. Soc. p. 639, 
pi. xlvi. figs. 2-7, pi. xlvii. figs. 1-3. 
Type. Imperfect anterior portion of fish ; British Museum. 
The type species, attaining a length of about OB. The length of 
the head with opercular apparatus considerably exceeds the 
maximum depth of the trunk, which is comprised about five and a 
half times in the total length of the fish. The two posterior sub¬ 
orbitals antero-posteriorly elongated and about equal in size, the 
postero-inferior plate also broader than deep; operculum much 
deeper than broad, its relative measurements being about 7:4. 
Pelvic fins arising much nearer to the anal than to the pectorals, 
immediately behind a point opposite the posterior end of the dorsal. 
Form. Log. Upper Cretaceous : Province of Ceara, N. Brazil. 
All the following specimens were obtained from Barra do Jardim, 
Serra de Araripe :— 
P. 4314 a. Very imperfect head and abdominal region, showing 
fossilised gill-filaments and muscular fibres, marked by 
Agassiz as the type specimen and noticed by him, Poiss. 
Foss. vol. iv. p. 293, footnote. Enniskillen Coll. 
47890. Nearly complete fish about 0*27 in length, displaying the 
paired fins and the base of the anal and caudal fins. 
Twelve rays can be counted in one of the pelvic fins, 
which are remarkably close to the anal. 
Presented by the Hon. Robert Mar sham, 1877. 
P. 4315. Almost similar specimen more imperfect, wanting the tail 
beyond the anal fin. There are doubtful indications of a 
relatively small gular plate. The right pectoral exhibits 
15 or 16 rays. Enniskillen Colic 
47889. Fine small fish in counterpart, showing the paired, but 
wanting the median fins. 
Presented by the Hon. Robert Marsham, 1877. 
P. 1958 d. More imperfect small fish. Egerton Coll. 
