1854.] HAMILTON — MAYENCE BASIN. 285 



This list shows an increasing proportion of land and freshwater 

 shells throughout the general mass, although the whole number of 

 species is hardly so great as in the lower beds of the Cerithium-lime- 

 stone. There is also a considerable change of species between the 

 two formations, and were it not for the Cerithia and Mytili, which are 

 still abundant, although the species are few, this might almost be 

 looked upon as a freshwater formation. This however is not the 

 case ; moreover certain species of Cerithia and Cyrena Faujasii occur 

 in the overlying blue clays, so that the brackish-water period must 

 not be considered as yet concluded. Here also, as in the preceding 

 formation, several forms of land shells make their appearance which 

 are strictly analogous to, some even identical with, those now existing 

 in one part or other of the Mediterranean basin. 



Table VI. 

 Fossils of the Ossiferous or Bone-bearing Sand. 



Fish, sp. Macrotherium, sp. 



Crocodilus, sp. Agnotherium antiquum, Kaup. 



Tortoise, sp. Dorcatherium Nani, Kaup. 



Hippotherium gracile, Kaup. Palaeomeryx minor, v. Meyer. 



Chalicotherium antiquum, Kaup. Cervus Bertholdi, Kaup. 



Goldfussii, Kaup. Partschii, Kaup. 



Anthracotherium magnum, Cuv. anocerus, Kaup. 



Tapirus priscus, Kaup. dicranocerus, Kaup. 



Sus antediluvianus, Kaup. curtocerus, Kaup, 



palseochcerus, Kaup. nanus, Kaup. 



antiquus, Kaup. Chalicomys Jaegeri, Kaup. 



Rhinoceros Goldfussii, Kaup. Gulo diaphorus, Kaup. 



' Schleiermacheri, Kaup. Machairodus cultridens, Kaup. 



incisivus, Cuv. Felis aphanista, Kaup. 



minutus, Cuv. ogygia, Kaup. 



Mastodon longirostris, Kaup. prisca, Kaup. 



Dinotherium giganteum, Kaup. antediluviana, Kaup. 



Bavaricum, v. Meyer. 



The isolated character of the deposits in which these osseous 

 remains are found has been already mentioned in the former portion 

 of this paper (page 272). It is only necessary here to observe, that 

 the occurrence of Anthracotherium magnum, (Cuv.), common to the 

 Marine Sands, and of Rhinoceros incisivus (Cuv.), R. minutus (Cuv.), 

 Palceomeryx minor (Von Meyer), and Hippothei'ium gracile (Kaup), 

 common to the Littorinella-limestone, proves that these ossiferous 

 sands, although somewhat newer, do in reality belong to the same 

 general system of tertiaiy deposits as the underlying formations. 



I wUl not attempt to point out any inferences as to the nature of 

 climate or geographical features of the then existing country, which 

 might be drawn from the habits and characters of the mammalian 

 animals whose remains have been here preserved ; I leave it to 

 the palaeontologists and cultivators of comparative anatomy, whom 

 we rejoice to reckon amongst our members and to see on our 

 benches, to work out the interesting problems connected with this part 



