426 WELLBURN : FISH FAUNA OF THE LOWER COAL MEASURES. 
Genus: Rhizodopsis (Huxley) Young, 1866. 
Sp. R. sauroides Williamson sp. 
Part of a body in a nodule in the shale above the Lower 
Foot Mine, Littleborough district ; a mass of eroded scales 
shown. Other specimens of scales, vertebrfe (?), teeth, <fec., found. 
The scales are thin, elongated oval, obtusely pointed behind, the 
exposed area being rhomboidal and marked, when abraded, by 
concentric ridges crossed by fine radiating striae. In some speci- 
mens in my collection from the Yorkshire Coal Measures this 
area is covered by a thin glittering layer of ganoine. PI. LXT., 
fig. 11. 
Family : Osteolepidae. 
Genus : Megalichthys Agassiz. 
Sp. 1. M. Hibherti Agassiz. 
This species is represented by scales, teeth, vertebrae, &c., 
and is found in both districts. 
Sp. 2. M pygmceus Traquair. 
Some scales from the Lower Foot Mine I refer to this 
species. They are small, and the layer of ganoine is thick and 
very coarsely punctate. 
Sub-order : Actinistia. 
Family : Coelacanthidae. 
Genus : Ccelacanthus. 
Sp. 1. C. elegmis Newberry. 
Operculse, jugular plates, scales from both districts, showing 
the characteristic ornamentation. PI. LXL, fig. 12. 
Sp. 2. C. Fhillipsi Agassiz. 
Caudal region of a large fish in a " Baum Pot " from the 
Halifax Hard Bed Coal. The Primary and Secondary caudal 
fins and also the anal (?) are shown. 
Order : Actinopterygil 
Sub-order : Chondrostei. 
Family : Paloeoniscidse. 
Genus: Elonichthys Giebel, 1848. 
Sp. 1. E. Aitkeni Traquair. 
