8 
ACTINOPTERYGII. 
Teeth small; operculum simple; an 
enlarged scale at base of paired 
fins ; lateral line simple . 
Teeth minute ; operculum subdivided 
by transverse suture ; lateral 
line radiating- on each scale tra¬ 
versed ; hindermost ray in dorsal 
and anal fins much elongated . . 
Teeth small; operculum subdivided 
by transverse suture ; lateral line 
simple. 
IT. Parietal bones relatively small and not 
meeting in the middle line. 
Teeth small; no deep depression in 
frontal region of skull; abdqmen 
rounded or flattened. 
Teeth small; deep depression in 
frontal region of skull; abdomen 
compressed to sharp edge. 
Teeth large and rounded; no deep 
depression in frontal region of 
skull. 
Teeth large, laterally compressed ; no 
deep depression in frontal region 
of skull; gape rather small.... 
Enlarged pair of teeth at symphysis 
of mandible; gape wide ; dorsal 
fin opposed to pelvic pair. 
As Spaniodon, but dorsal fin opposed 
to space between pelvic and anal 
fins . 
in. Incertae Sedis. 
Teeth of moderate size and slender, 
each tipped only with a cap of 
ena^mel; gape not much directed 
upwards. 
Elops (p. 22). 
Megalops (p. 24). 
Notelops (p. 27). 
Rhacolepis (p. 29). 
Thrissopater (p. 32). 
Pachyrhizodus (p. 37) 
Esocelops (p. 46). 
Spaniodon (p. 48). 
Thrissopteroides (p. o4). 
Protelops (p. 56). 
Grenus ELOPOPSIS, Heckel. 
[Denkschr. k. Akad. Wiss., math.-naturw. Cl. vol. xi. 1856, p. 251.] 
Trunk somewhat laterally compressed, abdomen flattened. Man¬ 
dible a little prominent, and gape extending behind the eye; one 
supramaxillary bone^; margin of the jaws with a series of robust 
conical teeth. Operculum simple; branchiostegal rays between 
25 and 30 in number. Vertebrae between 50 and 60 in number, 
the centra not longer than deep, all slightly constricted and marked 
