133 



Transactions of the Cambridge Philosophical Society. Vol. IX. Parts 1-3. 

 4to. Cambridge, 1851 - 3. 



Gelehrte Anzeigen. Herausgegeben von Mitgliedern der K. Bayer. Akademie 

 der Wissenschaften. XXXVIII. Miinchen, 1854. Received in Exchange. 



Encyclopaedia Britannica. 4to. Vol. 6. Boston, 1854. 

 History of the United States. By George Bancroft. Vol. VI. 8vo. Boston, 

 1854. Deposited by the Republican Institution. 



January 3, 1855. 

 The President in the Chair. 



The President presented to the Society, a copy of his 

 recently pubhshed volume, entitled, "Genealogy of War- 

 ren." 



The following communication was received, and read, 

 from Mr. I. A. Lapham, of Milwaukee, Wisconsin : 



ON THE NUMBER OF TEETH OF THE MASTODON GIGANTEUS. BY 

 I. A. LAPHAM, OF MILWAUKEE, WISCONSIN. 



Much interest was imparted to the Annual Exhibition of the 

 Wisconsin State Agricultural Society, for 1854, by a fragment of 

 the lower jaw bone of the extinct Mastodon giganteus, found 

 buried six feet deep in the ground, at a place known as Terre 

 Coupee, Michigan, by Mr. A. H. Taylor. It was the right ramus, 

 and a small portion of the extremity of the left, with three teeth, 

 the anterior one much worn, especially on the exterior side. Its 

 entire length is 26 inches ; its height and thickness is 6J inches, 

 measured opposite the space between the last two teeth. The 

 posterior elevated portions of the jaw are broken off; and also 

 the pointed extremity, where no traces are to be seen, either of 

 the small tusks that belong here, or of their cavities. The line 

 of the teeth has something of a spiral direction, the posterior 

 being directed obliquely inwards, the middle one more nearly 

 parallel with the general direction of the bone, while the ante- 

 rior tooth has a slightly outward direction. 



