In this period, which is called the Triassic (the name given to it by the German geologist Bronn because of the three distinct beds he found in it, though the middle of these, a shelly limestone, does not exist in Great Britain), there was a wide development of large reptiles and amphibians. We cannot enumerate them all, for not one chapter nor one volume would suffice to deal adequately with the reptiles of the Trias formations and of the Jurassic rocks which followed them, and of the Permian which preceded them. But we may speak of some of them. One of the most striking was the _Pareiasaurus_, which has been found in the Jurassic sandstones and limestones of South Africa, of Russia, of India and Scotland, and of middle England. The skeleton of the Pareiasaurus looks like that of a gigantic pug dog eight feet long; but it was a comparatively harmless animal, the teeth of which show that it largely fed on vegetable food. In Sir E. Ray Lankester's lectures on "Extinct Animals" he described the finding of a great many of these fossil reptiles by Professor Amalitzky on the banks of the River Dwina, near Archangel. There is a cliff of Permian strata on the banks of the Dwina, and in this cliff there is a peculiar pocket or accumulation of sandy matter with large hard nodules embedded in it. These nodules are removed and broken up for mending the roads. The pocket seems to be in a fissure and of Triassic age, later, that is to say, than the Permian rocks on either side of it. However that may be, the nodules are usually removed for road-mending, and four or five years ago Professor Amalitzky on visiting the spot was astounded and delighted to find that when broken each nodule was seen to contain the skeleton or skull of a great reptile. The Russian geologist determined to make a most thorough investigation of this wonderful deposit, and for years spent several thousand pounds in having the nodules dug out by the peasants after the year's farming work was over, and in removing them to the University of Warsaw, where with the finest instruments and greatest care the nodules are opened, and each bone removed in fragments is put together from its more or less broken parts, and firmly cemented and set up in its natural position as a complete skeleton.