It is a smaller animal than the Smooth Newt, its length being three inches only. In the breeding season its distinctness is evident, for the male has then a nearly four-sided body owing to the development of a fold of skin along each side of the back. The crest, instead of being high in front and having an undulating edge, rises gradually from the head, is of less height and has an entire margin. The tail appears as though the tip had been cut off and the attempt to renew it had got only as far as the development of a short thread from the centre of the cut portion. But what gives the species its name is a black web which connects the toes. The tail develops a fin along its lower edge in both sexes, and this in the male is edged with blue and in the female with orange. Another point of distinction lies in the colour of the throat. Instead of the black-dotted white or yellow of the Smooth Newt, the throat of the Palmate Newt is flesh coloured without dots. Above, the colour is olive-brown with darker spots; below, the centre is orange bordered by pale yellow, with or without black spots. After the breeding season, when the adults leave the water, the webbing of the feet--being no longer useful--becomes reduced to a margin along each toe and no longer constituting a palm; but the truncated tail remains as a specific distinction, though the thread-like prolongation becomes very short in the female. CLASSIFIED INDEX TO ORDERS, GENERA, AND SPECIES DESCRIBED IN THIS WORK. *Mammalia.* _Order Insectivora._ Talpa europæa, Linn., 13 Sorex araneus, Linn., 21 " granti, 25 " minutus, Linn., 25 Neomys fodiens, Schreber, 27 Erinaceus europæus, Linn., 9 _Order Chiroptera._ Rhinolophus ferrum-equinum, Schreber, 34 " hipposideros, Bechstein, 36 Myotis bechsteinii, Kuhl, 40 " daubentonii, Kuhl, 41 " mystacinus, Kuhl, 37 " nattereri, Kuhl, 39 Vespertilio murinus, Linn., 45 " pipistrellus, Schreber, 43 " serotinus, Schreber, 44 Nyctalus leisleri, Kuhl, 48 " noctula, Schreber, 46 Plecotus auritus, Linn., 49 Barbastella barbastellus, Schreber, 51 _Order Carnivora._ Vulpes canis, Linn., 52 Meles taxus, Boddaert, 55 Lutra vulgaris, Erxleben, 59 Mustela erminea, Linn., 66 " hibernicus, Thomas, 69 " martes, Linn., 63 " nivalis, Linn., 69 " putorius, Linn., 73 Felis silvestris, Schreber, 75 _Order Rodentia._ Oryctolagus cuniculus, Linn., 113 Lepus europæus, Pallas, 117 " hibernicus, Bell, 123 " timidus, Linn., 121 Muscardinus avellanarius, Linn., 82 Evotomys alstoni, Barrett-Hamilton, 112 " erica, Barrett-Hamilton, 113 " glareolus, Schreber, 110 " skomeriensis, Barrett-Hamilton, 112 Microtus agrestis, Linn., 105 " orcadensis, Millais, 109 Arvicola amphibius, Linn., 102