GEOLOGY. 



35 



cast of the skull of a young individual of Mastodon ohioticus from 

 shell-marl beneath a peat-bog in the State of New Jersey, United 

 States. 



In Pier-case 22 are" arranged fifteen heads and jaws, besides 

 numerous detached limb-bones, and other parts of the skeleton of 

 Mastodon ohioticus from North America. One fine lower jaw of 

 this species has a small tusk in front. 



Pier-case 21 is occupied with remains of Mastodon arvernensis 

 from Epplesbeim, M. angustidens from the Miocene of Sansan, and 



Fig. 7. — Lower Jaw of Mammoth, Elcphas primigeniu?. Dredged off the Dogger Bank, in 

 the North Sea, 1837.* (See Pier-case 16.) 



M. tapiroides from Haute Garonne in France, and M. Perimensis 

 from Perim Island, Gulf of Cambay. Of these there are some very 

 perfect remains, including about eight heads. The specimens of 

 M. angustidens and M. longirostris show clearly that this old type 

 of proboscidean had tusks, or incisor teeth, in both the upper and 

 lower jaws, as represented in Fig. 4, page 17. 



In Table-case 23 are arranged a large series of the molar teeth of 

 various species of Mastodon from the Red Crag of Suffolk, from 

 Epplesheim, from India, and from Ohio in North America, showing 

 all ages, from the milk-teeth to the last true molars of very aged 

 animals. 



* See Geo]. Mag. 1878. Decade II. Vol. v. PI. XII. p. 443. 



