WELLBURN : FISH FAUNA OF YORKSHIRE COAL MEASURES. 
169 
Genus : Elonichihys Giebel, 1848. 
Sp. E. Aitkeni Traquair, 1886. 
Sp. E. Egertoni (Egerton), 1850. 
Sp. E. semistriatus Traquair 1877. 
Sp. E. caudalis Traquair ? 1877. 
Sp. E. ohlongus Traquair? 1877. 
Sp. E. Traquairi sp. nov. 
All the above species of Elonichthys are — with the excep- 
tion of a single specimen of E. Aitkeni Tr., which shows the 
lower half of the fish for about two-thirds its length — found 
in a fragmentary condition. None of them are common, and 
their distribution is limited. 
Genus : Acrolepis Agassiz, 1833. 
Sp. A. Hopki7isi McCoy, 1844. 
Present mostly in a fragmentary condition, but one fine 
specimen — which is in the British Museum (Natural History), 
Cromwell Road — was found in a " Baum Pot " in the shale 
above the Halifax Hard Bed Coal. 
Rare, distribution limited. 
Family : Platysomatidse, 
Genus: Mesolepis Young, 1866. 
Sp. M. Wardi Young, 1866. 
In the author's collection there is a specimen of Mesoleins 
from Tingley; the posterior two-thirds of the body is shown, 
also the dorsal and caudal fins, but the ventral is absent. From 
the general form of the fish I place it in this species. Fragmentary 
remains are rarely found in Better Bed Coal shale, Low Moor. 
Rare, distribution limited. 
Sp. M. scalar is Young, 1866. 
There are two specimens from Tingley in the author's collec- 
tion, which, from the deep form of the body, appear to belong to 
this species. 
Pvare, distribution very limited. 
