traversed by numerous small lissurcs ; wliile the bones themselves, or the 
hollows which traversed them, are frequently replaced by oehreous material. 
The canal of the “lateral line” is often shown in this condition. The fishes 
are crowded together in shoals, as if suddenly destroyed; and very few of 
them have become disintegrated before fossilization. A glance at the 
accompanying plates will show how beautifully even the most delicate bones 
and fin-rays are usually preserved. 
All the tishes from the Talbragar horizon represent new species, and 
three of them belong to remarkable ncAV genera. The Memoir has, indeed, 
been much delayed by the novelty of the collection, which seemed to 
demand a very careful study of all the knowm Jurassic fishes before any 
description could be attenqited. This study is now almost completed, and 
the results Avill appear in the forthcoming third part of the “ Catalogue of 
Fossil Fishes in the British l\tuscum,” which may be consulted for a 
detailed discussion of the subject. 
It may be added that all measurements given in the l\[(unoir arc 
expressed as decimal fractions of the uudre. 
