88 
ACTING lTEKYGTI. 
[As Spathodactylus, but dorsal fin 
longer than deep and opposed 
to pelvic fins Cladocyelus (p. 1° 7 )'J 
(i) A presymphysial bone in man- 
dible. 
Similar skull and jaws, but the 
teeth compressed to a sharp 
edge, and a series of nutritive 
notches on the inner face of the 
jaw below the alveolar border . Saurodon (p. Ill) - 
Teeth compressed to a sharp edge, 
with germs of successors arising 
on the inner face, where there 
is a series of nutritive foramina . 
below the alveolar border .... Saurocephalus (p- H 
Genus CHIROCENTRUS, Cuvier. 
[Regne Animal, vol. ii. 1817, p. 178.] 
Trunk elongated and laterally compressed ; abdomen txencha ^ 
Teeth laterally compressed, firmly fixed in shallow sockets ; at e ’ 
one pair of premaxillary toeth enlarged, the other premaxillary a " 
maxillary teeth small and in singlo series ; mandibular teeth J ^ 
large, in a single series ; minute villiform teeth on the palatine ’ 
pterygoids, and tongue. Eight branehiostegal rays. R^s V j, 
delicate. A long pointed osseous appendage at the base ° c 
pectoral fin ; pectoral fins of moderate size, the length of the ra 
much less than that of the head with opercular apparatus , l’ e ^ 
fins very small ; dorsal fin short, opposed to tho anal, which i' '' 
extended bub not elevated into a pointed lobe in front ; can a 
deeply forked. ^ 
This is the sole surviving genus of the family, and is represen e 
only by one existing species in the Indian Ocean. 
Chirocentrus (?) polyodon, Gunther. 
18i6. Chirocentrus (?) polyodon, A. Gunther, Geol. Mag. [2] vo1 ' 
P- 438, pi. xv. fig. 3. 
Type. Dentary bone ; British Museum. , -y 
species doubtfully of this genus, known only by f ragmen 
1 s. fig teeth in the den tan - are slender, numerous, m 
ar 0 e ut irregular in size, and very closely set ; those of the max 
a out as large as the hindermost teeth of the dentary. 
° rm ' & L °c. Freshwater Tertiary Lignite : Padang, Sumatra. 
