8 Scientific Society of San Antonio. 



served. The diameter of this part varied from 5 to 6 1-2 inches. 

 It contained no portion of the pulp cavity- 



2. A lower jaw (Plate II, 2). The bone of this specimen 

 broke into many pieces, so that the teeth are no longer imbedded 

 in it. The latter are fairly well preserved. There were two 

 molars on each side, the first (Plate IV, 3 and 4) having three 

 cross ridges, and the last (Plate IV, 1 and 2), four of these 

 ridges and a final elevation, or heel. This last molar measures 



9 inches from front to rear. From these facts I infer that the 

 owner of this jaw was an adult animal of the Trilophodon sec- 

 tion of the genus Mastodon. 



3. A lower jaw (Plate II, 3). This specimen went to 

 pieces as badly as the preceding. Unfortunately the teeth from 

 the several jaws were not kept well separated in removing, 

 packing and unpacking them. As I was not present when the 

 remains were removed, I am unable to say fom personal observ- 

 ation which teeth belong to this specimen. I am assured by 

 Mr. Heusinger, however, that a certain peculiar tooth in our 

 collection was taken from this jaw. The crown of the 

 tooth is identical in structure with that of the last molar 

 already described ; but this specimen has no roots ; moreover, 

 it is comparatively small, and its enamel is not well matured. 

 A tiny tusk, one inch in diameter, was also found in this jaw 

 (Plate IV). Here is sufficient evidence that the animal from 

 which the jaw was derived was not yet adult. 



4. Part of a lower jaw formerly exhumed in the same spot as 

 the preceding specimens, and presented to the society by Dr. 

 Glaser. The bone of this fragment is firm and well preserved, 

 The teeth have been removed, but we possess what are evi- 

 dently parts of the two last molars of the jaw. At the front 

 end of the specimen can still be seen a part of the socket of a 

 small tusk, 2 inches in diameter. 



5. The upper end (18 inches in length) of a thigh bone- The 

 material of this specimen is fairly well preserved. Possibly 

 the bone could have been removed whole if all of it had first 

 been uncovered. The greatest diameter of this specimen is 13 

 inches; its circumference 12 inches from the upper end is 30 

 inches. 



6. Fragments of an acetabulum, or socket that receives the 

 upper end of the thigh bone. This was exposed on the west 



