32 
ACTINOPTE'RYGfH. 
Rhacolepis latus, Agassiz. 
1841. Phacolepis latus, L. Agassiz, Edinb. New Phil. Journ. vol. 
p. 83. 
1844. Rhacolepis latus, L. Agassiz, Comptes Rendus, vol. xviii. p. 1° 13 ’ 
and Poiss. Foss. vol. iv. p. 293 (name only). 
1887. Rhacolepis latus, A. S. Woodward, Proc. Zool. Soe. p. c3y ’ 
pi. xlvii. fig. 5. 
Type. Imperfect small fish ; British Museum. 
An imperfectly known small species with much-deepened trun ■ 
The two posterior suhorbitals a little broader than deep, and the 
postero-inferior suborbital of a deep triangular form ; operculum 
about twice as deep as broad. Pelvic fins arising about midway 
between the pectorals and the anal, opposite the anterior halt of the 
dorsal. 
Form - £ Toe. Upper Cretaceous : Province of Coara, N. Brazil. 
P- 1959, P. 3984. Type specimen, in counterpart, described and 
figured loc. cit. 1887 ; Barra do Jurdim, Serra do Araripe- 
Egerton ($• Enniskillen Colls- 
28616 c. Trunk doubtfully referred to this species, showing enlarge 4 
and elongated anterior dorsal fin-ray. Purchased, 1 S ' J ' 
15493. More imperfect similar trunk. 
Purchased from Mr. Gardner- 
Genus THRISSOPATER, Gunther. 
[Figs. & Dcscript. Brit. Organic Remains, dec. xiii. 
(Mem. Geol. Surv. 1872) no. 1.] 
Trunk somewhat laterally compressed ; abdomen compressed to 
an edge. P aT i e tal bones small and separated by the supraoccipda ; 
a deep quadrangular median pit in the cranial roof in the hinder 
part of the frontal region ; maxilla slender, with one supramaxillatf 
one; mandible a little prominent, and gape extending to the 
of arm 11 °^°* °! th ® ° rbit ’ Tnar P n of the jaws with a single series 
o smaU corneal teeth. Operculum simple; opercular hones and 
™ - P 6li S htl y dilated and smooth; branchiostcgal 
°I , v 30 Vertebr “ 50 in number, the centra 
an mini 8mootb ^tely ridged. Pectoral fin -f 
the d! 1 , C r l0ngated 8Cale at its base ; pelvic fins opposed to 
the dorsal; anal fin relatively small; caudal fin deeply forked; “° 
