PROF. L. C. MIALL ON A MEGALICHTHYsS. 349 
Fig. 2.—Left Pectoral fin of Megalichthys Hibbert. 
(One half natural size.) 
6, 6. Basal scales or fulera. 
Fig. 3.— Right Pectoral fin. (One half natural size.) 
(GIS 
Lic | — 
CO, — 
5. Basal scale, 
closely resembled that of some Elasmobranchs (fig. 5). The rows of 
large scales concealed a strong propterygium and metapterygium, 
while numerous radials, covered by small scales, proceeded from the 
outer edge of the metapterygium. The Elasmobranch type of 
ventral fin, thus closely reproduced in Megalichthys, may be traced, 
though with important modifications, in Polypterus, Polyodon, and 
Acipenser. In other recent Ganoids and in Teleostei the ventral fin 
differs almost as widely from the Elasmobranch type as does this 
from the archipterygium of Ceratodus or Dipterus. 
Q.J.G.8. No. 159. 2B 
