86 
ACTIXOMERYGII. 
Genus NOTOPTERUS, Lacepede. 
[Hist. Nat. Poiss. vol. ii. 1800, p. 189.] 
lrunk fusiform, with very short abdominal region and niuc 
elongated and attenuated caudal region. Dorsal fin very small, 1,1 
the caudal region ; anal fin much extended and confluent with t 
rudimentary caudal fin. A double series of short ventral ridge- 
scales in the abdominal region, 
Notopterus primeevus, Gunther. 
1876. Notopterus primeems, A. Gunther, Geol. Mag. [2] vol. in- P- ^ ’ 
pi. xix. 
Type. Imperfect fish ; British Museum. ^ 
An imperfectly known species, about 0-3 in length. Lower P® r 
of preoperculum and some ridges of mandible serrated. About ■ 
abdominal vertebrae. Dorsal fin above 14th and 15th cau 
vertebrae. Scales very small. 
Form, i Sr Loc. Freshwater Tertiary Lignite : Padang, Sumatra. 
47512 . Typo specimen described and figured by Giinther, he. c ^' 
Presented by Herr It. D. M. Verbeek, l'"' 1 
Family CHIROCENTRIDiE. 
Supraoccipital bone prominent, partly or completely separatm 
the parietals in the median line ; squamosals reduced, and 0 . 
region very prominent ; parasphenoid enclosing a basicranial can' ■ 
snout not produced ; cheek-plates well developed. Mandib ^ 
suspensorium inclined forwards, but gape of mouth wide and me 
or less directed upwards ; premaxilla and maxilla robust and firm 
fixed, both entering the upper border of the mouth ; teeth acumina 
almost or exclusively confined to the premaxilla, maxilla, and den nO 
bones. Opercular apparatus complete, with branchiostegal rap, 
no gular plate. Vertebral centra well ossified, none with trans'er 
processes ; ribs nearly or completely encircling the abdominal ca' J 
liajmal arches more or less fused at the base of the tail. I' 1 ^ 
muscular bones present. Fin-fulcra absent; fin-rays divided ^ 
closely articulated distally ; post-temporal bones in contact ' 
postero-lateral angles of cranium; dorsal and anal fins rc ®° 
Scales thin and cycloid. In the recent genus : — No pseudobiauc 
air-bladder incompletely divided into colls ; no pyloric app eIU 
intestine short, with a rudimentary spiral valve. 
