If this tooth belonged to _E. columbi_ and had the usual number of plates, 24, the length would have been near 600 mm., a size not probable. If it belonged to _E. imperator_, as the writer thinks it did, the original length was somewhere near 450 mm., a more reasonable, but at the same time, an unusual dimension.
4. _Everglades._—In the American Museum of Natural History, New York (No. 8068), is a part of a tooth once supposed to belong to the Indian elephant and said to have been mentioned somewhere by the geologist J. D. Dana as having been found in the Everglades. It appears to be well fossilized. It is apparently the second true molar of the right side. There are 12 plates, of which 5 occupy a line 100 mm. long. Some plates are evidently missing from the front. The writer believes that this tooth belongs to _Elephas imperator_.
5. _Arcadia, De Soto County._—In the U. S. National Museum (No. 189) is a part of the left ramus of the lower jaw of an elephant recorded as having been found on Peace Creek. This jaw was collected by J. Fras Le Baron, and in a report made to Professor S. F. Baird in 1881, he indicated that this fossil, with many others which he had sent to the Smithsonian Institution, had been found somewhere along Peace Creek between the mouth of Little Charlie Apopka Creek and tide-water, but the place is no more exactly designated; in any case not many miles away from Arcadia. It, with other Pleistocene fossils, was found in gravel overlying a soft yellow limestone about 4.5 feet thick.
The jaw has been described and figured by Leidy (Trans. Wagner Inst., vol. II, p. 23, plate VIII, fig. 2) as _Elephas columbi_. He stated that eight of the ridges occupy a space of 6.4 inches. His estimate was, however, made near the grinding-surface of the tooth, where the plates converge. The writer has removed the bone and some of the cement from the inner face of the tooth, so as better to expose the edges of the plates. It is found that four of the enamel plates, with the corresponding cement plates, occupy 100 mm. The plates are too coarse for the tooth to be that of _Elephas columbi_. The length of the tooth, in a straight line along the base, is 260 mm. Had the tooth originally had 22 plates, a moderate number for _E. columbi_, the total length would have been 500 mm. or more. Meanwhile, the width is only 85 mm. There are now 12 plates left, and there were at first probably 18. The original length was probably about 400 mm. or less. Leidy thought that the 12 plates present represented the complete number entering into the constitution of the tooth, but the exposure of the base of the tooth in front shows that a number of plates had been worn out and lost.
