15 
Platysomus macrurus , Ag. Thickley, Thrislington, and 
Ferry Hill. 
Platysomus striatus , Ag.—-P. parvus, Ag. It will be seen, 
that I have merged Platysomus parvus into this species. 
M. Agassiz founded the former on the figures given by Mr. 
Winch in the Trasactions of the Geological Society, and not 
on an examination of the originals : these (which are in the 
Sunderland Museum) I have lately examined, and I cannot 
find any difference between them and an undoubted P. striatus 
in the Newcastle Museum. The draughtsman of Mr. Winch’s 
figures has not copied the originals so closely as could be 
desired: he has, in consequence, incorrectly represented the 
dorsal and the ventral fin of the same length, the posterior 
part of the body too round, the head too large, and the root of 
the tail (which is injured in the originals) too slender. Be¬ 
sides occuring in marl slate with the last, in the localities 
named, this species has been found in the compact limestone 
in Pallion quarry. 
Acrolepis Sedgwickii, Ag. 
Pygopterus mandibularis, Ag. 
Ccelacanthus granulosus, Ag. 
The three sauroidal fishes just cited occur in most of the 
marl slate localities already given. 
Specimens of most of the fishes herein noticed are exhi¬ 
bited in the Museum of Newcastle-on-Tyne. It has long 
been my wish, that the Museum should be rich in these 
fossils, and that they should form one of its attractive fea¬ 
tures. The collection, as it now exists, will shew, that I have 
not laboured without some success. 
