290 PROBOSCIDIA. 



Mastodon giganteus, which now appear to complete the 

 demonstration of the specific identity of the Mastodon 

 longirostris, and Mastodon angustidens. 



Besides portions of jaws and numerous detached molar 

 teeth, fragments of tusks have been discovered in the 

 fluvio-marine crag, exhibiting the characteristic decus- 

 sating curvilinear impressions of true ivory, and most 

 probably belonging to the Mastodon angustidens, which 

 continental fossils prove to have possessed two large tusks 

 in the upper jaw, like the Mastodon giganteus of America 

 (see fig. 102). These tusks are less extensively, and less 

 obliquely curved than the tusks of the Mammoth (fig. 85). 

 Certain individuals of the Mastodon angustidens, probably 

 the males, have likewise been shewn by continental spe- 

 cimens, to have had small straight tusks in the lower jaw, 

 and I am able to add the testimony of a British fossil in 

 proof of this correspondence between the European narrow- 

 toothed Mastodon, and the Mastodon giganteus of North 

 America. 



Mr. Fitch has this year communicated to me his latest 

 discoveries of Mastodontal and other Mammalian remains 

 in the crag formations of Norfolk, and he has been so 

 obliging as to forward to me the specimens for description. 

 In a note dated " Norwich, September 6th, 1 844," he says : 

 " Since you last saw my collection, I have added several 

 very good specimens, which I think you would like to hear 

 about, if not to see. I have obtained several other Mas- 

 todon's teeth, one beautifully perfect, and precisely similar 

 to one figured in the Geological Transactions, vol. vii. pi. 

 xxxix. figs. 1, 2, and 3. I have also what I suppose to be 

 the tooth of a Trogontherium, and a tooth I imagine to 

 be of a Bear. I shall be very happy to send them up for 

 your inspection, if you think them of any interest. They 



