68 
WELLBURN : ON THE GENUS MEGALICHTHYS, AGASSIZ. 
Explanation of Plates. 
Throughout the plates the same letters apply to the same 
bones or parts of the fish. 
Head Bones, &c. 
ST. 
Supratemporals. 
P. Op. 
Pre-operculum. 
Pa. 
Parietals. 
Op. 
Operculum. 
Fr. 
Frontals. 
S.Op. 
Sub-operculum. 
Sq. 
Squamosal. 
PMx. 
Premaxilla. 
p.r. 
Posterior Frontal. 
Mx. 
Maxilla. 
E. 
Ethmoidal. 
D. 
Dentary. 
N. 
Nasal. 
ID. 
Infradentaries. 
Na. 
Nares. 
Ag. 
Angular. 
A.F. 
Anterior or Prefrontal. 
L.J. 
Lateral Jugulars. 
A.O. 
Anterior orbital. 
J. 
Jugulars (principal). 
S.O. 
Sub-orbital. 
S.CL 
Supra-clavicular, 
s.o\ 
Supra orbital. 
CI. 
Clavicle. 
P.O. 
Post orbital. 
I.Ch 
Infra-clavicular. 
0. 
Orbit. 
Az.J. 
Azygos Jugular. 
Cheek plates. 
Parts of Body, &c. 
LrL. Lateral line. 
P.P. Pectoral fin. 
Y.F. Ventral fin. 
A. F. Anal fin. 
1st D.F. 1st Dorsal fin. 
2nd D.F. 2nd Dorsal fin. 
C.F. Caudal fin. 
B. S. Basal scales. 
U.S. Ridge scales. 
F.S. Fulcral scales. 
I'L.P.S. Lateral pelvic scales. 
P.S. Pelvic scales. 
rL.p.s 
.S. Medial pelvic scales. 
A.S. Anal scales. 
