CHIBOCENTKIDiE. 
8 
Synopsis of Genera. 
I. Extended anal fin not elevated into an 
acuminate lobe anteriorly. 
Teeth laterally com pressed and firmly 
fixed in shallow sockets, much 
enlarged in premaxilla aad den- 
tary ; pectoral fins normal 
Teeth small, nearly uniform in size, in 
close series ; pectoral fins much 
enlarged 
Teeth rounded in section, of moderate 
size, in close uniform series, only 
one pair being enlarged at the 
mandibular symphysis ; pectoral 
fins rather large . . . . 
II. Extended anal fin [when known] elevated 
into an acuminate lobe anteriorly. 
A. Teeth in sockets, irregular in size 
and much enlarged in premaxilla. 
About 20 branchiostegal rays ; rays 
of paired fins much expanded ; 
scales large and smooth 
[Skull and jaws as in Chirocmtrites, 
with deep suprnoccipital crest; 
teeth with vertical successors, 
not compressed to a sharp edge, 
and no nutritive foramina or 
notches on the inner face of the 
jaw below the alveolar border . 
B. Teeth in sockets, nearly regular in 
size on each bone, not much 
enlarged in premaxilla. 
(a) No presymphysial bone in man- 
dible. 
Teeth not compressed to a sharp 
edge; caudal vertebra; about 
35 in number ; rays of paired 
fins much expanded ; dorsal fin 
short-based, opposed to anal ; 
scales large aud smooth 
[Skull, jaws, and teetii as in Spathc- 
dactylus, with small supra- 
occipital crest ; teeth with 
vertical successors and no nu- 
tritive foramina or notches on 
the inner face of the jaw below 
the alveolar border 
Chirocentrus (p. 88). 
Platinx (p. 89). 
Chiromystus (p. 89). 
Chirocentrites (p. 90). 
Portheus (p. 92).] 
Spathodactyhis' i (p. 98). 
Ichthyodectes (p. 99).] 
