Remains of Mastodons found in Norfolk Strata. 151 



Delesserla Hypogiossum Ag., Grev. Algce Brit., p. 75. t. 12. 

 Dr. Greville remarks of this species, M In Britain, its full 

 length is about 3 in. ; but a specimen in my possession, 

 gathered by Miss Hutchins in Ireland, measures about 8 in." 

 A specimen obtained by Dr. Drummond at Larne, in June, 

 1835, measures 19J in. in length; and many more, collected 

 at the same time, are in size very little inferior to it. 



Rhodomenia sobolifera Grev. ; JPucus soboliferus Eng. Bot., 

 t 2133. Obtained in different parts of Strangford Lough, 

 by Mr. Hyndman and myself, in 1834 and 1835 : some of 

 the specimens exceeded 7 in. in length. 



Rhodomela lycopodioides Ag. ; i'ucus lycopodioides Eng. Bot., 

 t. 1163. Not of uncommon occurrence on the stems of 

 Laminaria saccharina at Bangor, in October, 1835. 



Cbdium tomentbsum Stackh., Grev., Algce Brit., p. 185. t. 19., 

 has been found at Larne, occasionally, during winter, by 

 Dr. Drummond, but not of late years. 

 Donegal Square, Belfast, Jan. 27. 1836. 



Art. VII. Evidence in Argument that Remains of Mastodon 

 giganteus and Mastodon latidens have been found in the Tertiary 

 Beds of Norfolk. By Samuel Woodward, Esq. 



Some doubts having been expressed by Mr. Bakewell, in 

 37 — 4?2., as to the existence of the remains of mastodon in 

 the tertiary beds of Norfolk, I beg permission to lay before 

 your readers a few brief remarks on the subject. 



The distinctive characters of the grinders of the elephant 

 and mastodon are so decided, that it is scarcely possible to 

 mistake the one for the other. The enamel of the former is 

 disposed in pairs transversely, to the number of about ten, sur- 

 rounded and held together by what Parkinson terms the 

 crusta petrosa. Now, the enamel of the grinder of the mas- 

 todon is all external ; whilst the crusta petrosa, or a substance 

 resembling it, is internal. * I saw a tooth of the elephant, the 

 other day, in the collection of the Rev. William Foulger, 



* Since the above was written, I have read Mr. Clift's remarks on the 

 fossil remains from Ava, published in the Geological Transactions, 2d se- 

 ries, vol. ii. Speaking, in p. 373., of the tooth of M. elephantoides, and 

 its near approximation to those of the elephant, he proceeds to r say, " It is 

 not impossible that there may yet be a link wanting, which might be sup- 

 plied by an animal having a tooth composed of a greater number of den- 

 ticules, increasing in depth, and having the rudiments of crusta petrosa, that 

 necessary ingredient in the tooth of the elephant (for it is the animal mor- 

 tar, as it were, by which the plates, or denticules, are cemented together), 

 the entire absence of which distinguishes the tooth of the mastodon." 



m 4 



