278 REPORT OF NEW JERSEY STATE, MUSEUM. 
bb. Caudal margin concave; opercle prolonged behind in a convex pro- 
cess or flap, which is always black; dorsal spines X; anal III. 
d. Lower pharyngeals narrow; teeth usually sharp, not conical. 
LEPOMIS 
dd. Lower pharyngeals broad and convex, especially in adult; 
teeth more or less blunt and paved. EUPOMOTIS 
Genus ACANTHARCHUS Gill. 
The Mud Sun Fishes. 
Acantharchus pomotis (Baird). 
REATE SZ: 
Mud Sun Fish. Bass Sun Fish. 
Plead’ 274 -"deptn' 2 45, Dr xa, Tek Ve rh, 1 oe sedi comene 
in lateral line to base of caudal; 6 scales obliquely back from 
origin of spinous dorsal to lateral line; 12 scales in a vertical 
series between origin of spinous anal and lateral line; mandible 
2'/,) in head, measured from its own tip; fourth dorsal spine 
324; sixth dorsal ray 124; fourth anal spine 4; sixth anal ray 
about +2; caudal 17/,,; ‘pectoral’ 1%; ventral 41%. ventral 
spine 3; snout 5% in head, measured from tip of upper jaw; eye 
4%; maxillary 2%; least depth of caudal peduncle 2. Body 
robust, moderately compressed, and not much elevated. Head 
large. Snout short, rather broad and convex. Eye circular, 
moderate, and about first third in length of head. Mouth wide, 
not large, and gape short. Mandible protruding. Maxillary 
oblique, about reaching posterior margin of orbit, and its distal 
expansion 1% in orbit. ‘Teeth rather large, conic, and in bands 
in jaws. Vomerine, palatine, pterygoid and lingual teeth small, 
latter in a single patch. Interorbital space flattened and forming 
a depression in upper profile. Nostrils close in front of upper 
orbital rim. Gill-rakers 5, 2 on lower limb of first arch, lanceo- 
late, and longest a trifle shorter than pupil. Scales large, cycloid, 
reduced along bases of fins and on predorsal region. Lateral line 
of rather large simple tubes, rather concurrent with dorsal profile. 
Small scales on bases of rayed dorsal, anal and caudal. Spinous 
