30 
actinopterxgxi. 
Rhacolepis buccalis, Agassiz. 
1831. Figure by Spix & Martins, Reise in Brasilien, Atlas, ph xxl '' 
fig. 5. 
1841. Rhacolepis bucculis, L. Agassiz, Edinb. New Phil. J° urn ' 
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, Proe. Zool. Soc. p- £> 39 - 
pl. xlvi. figs. 2-7, pi. xlvii. figs. 1-3, 
T ype. Imperfect anterior portion of fish ; British Museum. 
The type species, attaining a length of about 0 3. 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-iuferior plate also broader than deep ; operculum »uch 
deeper than broad, its relative measurements being about 7 : ^ | 
Pelvic fins arising much nearer to the anal than to the pectorals, 
immediately behind a point opposite the posterior end of the dorsal. 
Form. <$• Loc. Upper Cretaceous : Province of Ceara, N. Brazil- 
All the following specimens wero obtained from Barra do Jardim. 
Berra de Araripe : — 
P. 4314 a. Very imperfect head and abdominal region, showing 
fossilised gill-filaments and muscular fibres, marked by 
Agassiz as tho type specimen and noticed by him, l’ 0 ' 99, 
Foss. vol. iv. p . 293, footnote. Enniskillen CoU- 
47890. Nearly complete fish about 0-27 in length, displaying the 
paired fins and the base of tho anal and caudal fi” 9 - 
Twelve rays can be counted in one of the pelvic fins, 
which are remarkably close to tho anal. ^ ! 
Presented by the lion. Robert Marsham, lS‘ , - 
P- 4315. Almost similar specimen more imperfect, wanting the tail 
beyond tho anal fin. There are doubtful indications of » 
relatively small gular plate. The right pectoral exhibit 9 
15 or 1(5 ra y®- Enniskillen CoU- . 
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 CoU- 
