_Ungulata._--These are more numerous. Equidæ (horses) are represented by the Miocene _Anchitherium_ in the Lower, and by a more ancient form, _Anchilophus_, in the Middle Eocene of France. Tapiridæ and Palæotheridæ were very numerous. _Palæotherium_ and the allied genus _Paloplotherium_, were abundant in France and England in Upper Eocene times. They somewhat resembled the tapir, with affinities for the horse and rhinoceros. A new genus, _Cadurcotherium_, allied to the rhinoceros and equally large, has been found in the same deposits of phosphate of lime as the lemur and _Ælurogale_. In the Middle Eocene of both England and France are found _Lophiodon_ allied to the tapir, {126}but in some of the species reaching a larger size; _Propalæotherium_ and _Pachynolophus_ of smaller size and having affinities for the other genera named; and _Plagiolophus_, a small, slender animal which Professor Huxley thinks may have been a direct ancestor of the horse. In the Lower Eocene we meet with _Coryphodon_, much larger than the tapir, and armed with large canine teeth; _Pliolophus_, a generalised type, allied to the tapir and horse; and _Hyracotherium_, a small animal from the Lower Eocene of England, remotely allied to the tapir. Among the Artiodactyla, or even-toed ungulates, the swine are represented by several extinct genera, of moderate or small size--_Acotherium_, _Choeropotamus_, _Cebochoerus_ and _Dichobune_, all from the Upper and the last also from the Middle Eocene of France; but _Eutelodon_, from the phosphate of lime deposits is large. The _Dichobune_ was the most generalised type, presenting the characters of many of the other genera combined, and was believed by Dr. Falconer to approach the musk-deer. The _Cainotherium_ of the Miocene also occurs here, and an allied genus _Plesiomeryx_ from the same deposits as _Euteledon_. The Eocene Anoplotheridæ were numerous. The _Anoplotherium_ was a two-toed, long-tailed Pachyderm, ranging from the size of a hog to that of an ass; the allied _Eurytherium_ was four-toed; and there are one or two others of doubtful affinity. All are from the Upper Eocene of France and England. _Rodentia._--Remains referred to the genera _Myoxus_ (dormouse) and _Sciurus_ (squirrel) have been found in the Upper Eocene of France; as well as _Plesiarctomys_, an extinct genus between the marmots and squirrels. The Miocene _Theridomys_ is also found here. _Marsupials._--The _Didelphys_ (opossum) of Cuvier, now referred to an extinct genus _Peratherium_, is found in the Upper Eocene of France and England.