The first American mammal found in the Jurassic, and a large proportion of those since discovered, belong to a peculiar family which the writer has called the Dryolestidœ. It includes several genera and numerous species from America, and is likewise represented among the forms found in Europe.

In a paper recently read before the Geological Society, I ventured the conclusion that the bulk at least of the “pyromerides” of the Continent would be found to be altered lavas of an originally glassy character. The careful drawings and descriptions of various petrographers formed a strong chain of evidence; and the observations of Mr. T. Davies on materials from Bouley Bay, Jersey, seemed to establish beyond a doubt the connection between rocks authoritatively styled pyromerides and those regarded in this country as ancient rhyolites. Last autumn I visited one of the most typical continental localities, the richly-wooded Tiefenbach valley west of Wuenheim in the Vosges, and a few notes on specimens then, collected may possibly be of interest to workers in a similar field.

Among the early Tertiary Fishes in the British Museum, there are a number of detached spines and cranial fragments from the Middle and Upper Eocene beds of Bracklesham and Barton, which are undoubtedly referable to extinct members of the family of Siluridæ. With the exception, however, of three specimens figured and briefly noticed by Dixon in his work on the fossils of Sussex, all have remained hitherto undescribed; nor is it an easy task to base any satisfactory identifications upon such fragmentary materials.

The two admirable summaries of our knowledge of fossil Crocodilia recently published by Mr. A. Smith Woodward—the one relating to British forms, in this Magazine, and the other, comprising the whole order, in the “Proceedings of the Geologists' Association”—render it a comparatively easy matter to find out what is known concerning any particular species or genus; and I may accordingly at once proceed to the proper subject of this paper.

The two specimens figured below are from the collection of Mr. C. J. Read, of Salisbury, who obtained them from the Upper Chalk (Senonian) of the neighbourhood. Some uncertainty has attached to the exact locality, Mr. Read having told me that he had found them in the Mucronata-Chalk of Clarendon; but he now writes, 18th Jan. 1887—“My belief, on thinking the matter over, is that the right locality is the ‘Devizes Eoad,’ as they were originally marked.” The locality referred to is Old Camp Down lime-pit, three miles N.W. of Salisbury on the Devizes Road.