specimens are in local private collections. The following list may give some assistance to any person wishing to come at the material relating to any one of these mammalian forms which yet requires working out. Coryphodon and Hyracotherium, the teeth of which occur in this bed, are excluded from consideration, since they are clearly of an earlier age than the other forms, and are in a different mineral condition. The late Dr. Falconer mistook a coryphodont molar in the British Museum (no. 27432), from the Suffolk bone- bed, for the premolar of Mastodon arvernensis. All the mammalian remains about to be enumerated are in one and the same mineral condition, having a peculiar gloss and weight ; in most cases the enamel crowns only of the teeth occur, the bony fangs having been destroyed. In some carnivorous teeth, and in two Mastodon-teeth, I have seen the fangs preserved. No bone which could be identified with any of the teeth has ever been found in the bed. The species are placed in order of abundance.
1. Sw, sp. Molars of every size are to be met with. Mr. Whincopp, Mr. Canham, and Mr. Baker have the best specimens. Mr. Whincopp has a large imperfect canine.
2.- Rhinoceros Schleiermacheri, Kaup. Fragments of Rhinoceros- teeth are abundant in collections ; perfect specimens very rare, especially specimens of the posterior upper true molars ; Mr. Whincopp has two such molars ; Mr. MacLean, of Yarmouth, has one. Anterior upper molars are not so rare ; there is one in the British Museum, and two or three more or less perfect in the Ipswich Museum, in Mr. Whincopp's, Mr. Baker's, and Mr. Canham's cabinets. Lower molars in a perfect state (as far as the crown is concerned) are more common.
It is well ascertained that some of these teeth belong to R. Schleiermacheri, but it has been suggested that there are indications of R. etruscus and of R. megarhinus. It is most desirable that this point should be cleared up as far as possible.
3. Tapirus prisus, Kaup. Specimens of molar-crowns of Tapir, more perfect than that on which Prof. Owen based his identification of the Suffolk form with Kaup's T. priscus, and from various parts of the molar series are in Mr. Whincopp's and Mr. Baker's collections. The Rev. H. Canham, of Waldringfield, has the finest series, — six well-marked specimens. The Tapir-teeth are certainly of the same age as the Rhinoceros-teeth, if we may infer any thing from identity of mineral condition and colouring.
4. Mastodon (Tetralophodon) arvernensis, Croizet and Jobert. Very fine ultimate molars are — one in the Ipswich Museum, presented by Mr. Packard, another at York, in Mr. Reed's collection ; Mr. Whincopp has no perfect large specimen, but a beautiful milk- molar ; Mr. Baker has a series of seven, nearly all perfect teeth ; Mr. Canham has two very perfect penultimate upper molars, one with the fangs attached ; in the British Museum is a perfect crown of the lower ultimate molar and some fragments. Altogether there cannot have been taken out of the Suffolk bone-bed more than thirty perfect or nearly perfect molars of Mastodon arvernensis. The only
