CHIROCENTPwID^. 
87 
Synopsis of Genera 
I. Extended anal fin not elevated into an 
acuminate lobe anteriorly. 
Teeth laterally compressed and firmly 
fixed in shallow sockets, much 
enlarged in premaxilla and 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. 
TI. Extended anaTfin [when known] elevated 
into an acuminate lobe anteriorly. 
A. Teeth in sockets, irregular in size 
and much enlarged in premaxilla. 
About 20 branchiostegal ravs; ravs 
of paired fins much expanded; 
scales large and smooth. 
[Skull and jaws as in Chirocentrites, 
with deep supraoccipital 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. 
(«) No presymphysial bone in man¬ 
dible. 
Teeth not compressed to a sharp 
edge; caudal vertebrae about 
35 in number; rays of paired 
fins much expanded ; dorsal fin 
short-based, opposed to anal; 
scales large and smooth. 
[Skull, jaws, and teeth 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). 
Chii'omystus (p. 89). 
Chirocentrites (p. 90). 
Portheus (p. 92).] 
Spathodactyhisfp. 98). 
lehtkyodectes (p. 99).] 
