90 
ACTINOPTERTGII. 
upper teeth of moderato size, in a single uniform series ; lower teeth 
in a similar single uniform series, but one pair at the sympty 31 * 
much enlarged. Vertebra about 50 in number, nearly half being 
caudal ; centra with two deop, longitudinally-extended pits on cool* 
side ; ribs comparatively stout, flattened and impressed with a 
longitudinal groove. Pectoral fins rather large ; pelvic fins 
small ; dorsal fin short, opposed to the anal, which is somewha 
extended ; caudal fin deeply forked. Scales large, smooth, ftn 
very thin. 
The characters of the dentition are here given on the assumpU 0 
that the skull recorded below is rightly referred to this genus. 
Chiromystus mawsoni, Cope. 
l «««' C ’ lirom y stus mawsoni , E. D. Cope, loc. cit. p. 4. 
Chiromystus mawsoni, A. S. Woodward, Ann. Mag. 
[6] vol, ii. p. 134. 
Nat. Hist- 
Type- Imperfect trunk ; Cope Collection. f 
The type species, attaining a length of about 04. ]X'P th 
ongest ribs with vortebral centra contained about four and a thir 
times in the length from the pectoral arch to the base of the can » 
hn. Origin of anal fin equidistant from the pelvic and caudal fins- 
Form - & Loc - Upper Cretaceous : Bahia, Brazil. 
P ' 7345 ‘ Imperfect skull, of which the jaws are figured, nps lde 
down, by Allport, Quart. Journ. Gcol. Soc. vol. xvi. ( l8b 
pi. xiv. fig. 4. Presented by Samuel Allport, Esq-i 
P- 7110. Fragmentary remains of head and anterior part of ab 
dominal region with pectoral fin. • . 9 g_ 
Presented by Joseph Maivson, Esq-, 
P. 5531. Portion of small caudal region, noticed by A. S. 
ward, loc. cit . ; from Itacaranha. 1888- 
Presented by Joseph Maw son, Esq-, 
Genus CHIROCENTRITES, Hcckel. 
[Sitzungsb. k. Akad. Wiss., math.-naturw. Cl. 1849, pt. i- P- l7 ' J 
rp ,. Un ^ Ldotl Sated and laterally compressed ; abdomen Irene 
not compressed to a sharp edge: very irregular in si/G 
a eas one pair i n the promaxilhe much enlarged. qU 
anc ios egal rays. Vertebra) approximately GO in number, a 
do being abdominal ; the centra exhibiting two deep, long it « din ^ 
extended pits on each side ; ribs comparatively stout, each AaH eI1 
