INSTITUTE OF SCIEN'CE, PHILADELPHIA. 23 



ranging from 3I to 5 inches. In the Peace Creek molar eight plates of the 

 triturating surface occupy a space of 6f inches. 



In a recent visit to London, in the British Museum, the writer observed 

 a specimen similar to the Peace Creek molar, labelled Elcphas primigenius, 

 San Felipe de Austin, Texas. 



A sketch of another specimen, preserved in the cabinet of Wabash Col- 

 lege, Cra\vfords\ille, Indiana, has been submitted to the writer by Prof E. O. 

 Hovey, who gi\es the weight of the tooth as 21^ pounds and the dimen- 

 sions as follows: Length from the upper back to the lower forepart, 15 

 inches ; height, 13 inches ; fore and aft breadth of the triturating surface, 75^ 

 inches; transverse breadth, 3^ inches. The triturating surface of the sketch 

 displays about a dozen transverse ellipses or plates. 



Submitted to the writer, from the Smithsonian Institution, are two speci- 

 mens pertaining to the American Elephant, both from Peace Creek, and 

 presented to the Institution by Mr. J. F. Le Baron. One of the specimens 

 is the intermediate and greater portion of a last upper molar tooth agreeing 

 with the corresponding portion of the tooth above described. The other 

 specimen is the greater part of the right ramus of a mandible containing 

 the last molar tooth. It is represented in figure 2, plate VIII. The jaw-bone 

 accords pretty closely with the corresponding part of that of the Elcphas 

 primigenius as represented in Mr. Adams' Monograph above quoted. The 

 tooth is worn its entire breadth, and on the triturating surface measures 

 10^ inches fore and aft and 3-1- inches transversely, and displays twelve 

 ellipses or plates, which appear to be the complete number entering into 

 the constitution of the tooth. Eight of the ridges occupy a .space 6| 

 inches. 



In the museum of the Academy of Natural Sciences of Philadelphia is 

 a specimen consisting of the po.stcrior and greater portion of a last molar 

 tooth from the Caloosahatchie River, Florida, presented by Mr. Hamilton 

 Disston. It resembles the corresponding portion of the tooth in the jaw 

 fragment above described. Of the triturating surface 4i inches are occupied 

 by the posterior eight constituent plates. 



In his Monograph, Mr. Adams says he has not seen a lower last molar 

 of the Elephas primigcniiis \vith so low a ridge formula as eighteen plates. 

 He records a number of specimens ranging from 9 to 13 inches in breadth 

 with from nineteen to twenty-four plates. In different teeth eight plates 

 occupied a space ranging from 3'/( to 5 inches. 



The Florida teeth evidently indicate an Elephant with much coarser- 

 plated molars than those ascribed to the Elcplias primigenius of Europe, 

 Northern Asia and Northern America. As first distinctly indicated by Dr. 

 Falconer (Palaeontological Memoirs, i<S68, Vol. II., page 212), they pertain 

 to another variety or perhaps species, which he named the ElepJias Colinnhi, 

 and which lived in the regions bordering the Gulf of Mexico. 



