In the case of fishes, again, I might say much on the curious fact that the Cyprinidae, or white fish--carp, &c.--and their natural enemy, the pike, are indigenous, I believe, only to the rivers, English or continental, on the eastern side of the Straits of Dover; while the rivers on the western side were originally tenanted, like our Hampshire streams, as now, almost entirely by trout, their only Cyprinoid being the minnow--if it, too, be not an interloper; and I might ask you to consider the bearing of this curious fact on the former junction of England and France. But I have only time to point out to you a few curious facts with regard to reptiles, which should be specially interesting to a Hampshire bio- geologist. You know, of course, that in Ireland there are no reptiles, save the little common lizard, _Lacerta agilis_, and a few frogs on the mountain-tops--how they got there I cannot conceive. And you will, of course, guess, and rightly, that the reason of the absence of reptiles is: that Ireland was parted off from England before the creatures, which certainly spread from southern and warmer climates, had time to get there. You know, of course, that we have a few reptiles in England. But you may not be aware that, as soon as you cross the Channel, you find many more species of reptiles than here, as well as those which you find here. The magnificent green lizard which rattles about like a rabbit in a French forest, is never found here; simply because it had not worked northward till after the Channel was formed. But there are three reptiles peculiar to this part of England which should be most interesting to a Hampshire zoologist. The one is the sand lizard (_L. stirpium_), found on Bourne-heath, and, I suspect, in the South Hampshire moors likewise--a North European and French species. Another, the _Coronella laevis_, a harmless French and Austrian snake, which has been found about me, in North Hants and South Berks, now about fifteen or twenty times. I have had three specimens from my own parish. I believe it not to be uncommon; and most probably to be found, by those who will look, both in the New Forest and Woolmer. The third is the Natterjack, or running toad (_Bufo Rubeta_), a most beautifully spotted animal, with a yellow stripe down his back, which is common with me at Eversley, and common also in many moorlands of Hants and Surrey; and, according to Fleming, on heaths near London, and as far north-east as Lincolnshire; in which case it will belong to the Germanic fauna. Now, here again we have cases of animals which have just been able to get hither before the severance of England and France; and which, not being reinforced from the rear, have been forced to stop, in small and probably decreasing colonies, on the spots nearest the coast which were fit for them.