2 PROCEEDINGS OF THE NATIONAL. MUSEUM Vol. 68 



The thickness of the costal plate, at about the middle of its length, 

 is 20 mm. The femur was about the size of that of a medium-sized 

 liorse. The side-to-side diameter of the articular surface is 68 mm. ; 

 the oblique and greatest, 82 mm. 



Of the alligator there is present the distal half of the right man- 

 dible and a dorsal bony scute. The jaw contains sockets, or parts 

 of them, of 15 teeth. Near the front is the socket for what may be 

 called the canine; this socket has a diameter of 23 mm. Behind 

 this come sockets for 7 small teeth, and behind these 4 sockets whose 

 diameters are 16, 20, 19, and 15 millimeters. These teeth appear 

 to have been much larger than those of an alligator in the United 

 States National Museum whose length is 11 feet. The jaw does 

 not, however, appear to be much larger. From the front of the 

 canine socket to the rear of the last one mentioned is 185 mm. The 

 dorsal scute is 55 mm. wide and 52 mm. long. 



Of the Megathenum there is present a part of one tooth, ap- 

 parently the front half of the lower first one, and one astragalus. 

 The width of the tooth is 32 mm. The diameter of the astragalus 

 is 6.5 inches. 



Of C hlaTnytherium (pi. 2, fig. 2) there is a part of the right side 

 of the lower jaw containing the four hinder teeth. This row meas- 

 ures 90 mm. Several teeth of Equus are present; two little-worn 

 right upper premolars, pm^ and pm*, and a last molar are identified 

 as Equus coinplicatus. Five lower teeth may belong to the same 

 species, A lower second premolar, much waterworn, is taken to be- 

 long to E. littoralis; but it may belong to E. tau. Its crown meas- 

 ures, fore-and-aft, only 23.5 mm.; its thickness is 10.5 mm. A 

 bison is represented by a lower molar and most of the ulno-radius. 

 These seem not to differ from the same elements of the existing 

 bison, but it probably belonged to an extinct species. A deer, quite 

 certainly a species of Odocoileus, is known from only 130 mm. of 

 the upper part of the right hinder cannon bone. At 50 mm. below 

 the upper end the fore-and-aft diameter is 19.5 mm. ; the sicle-to- 

 side diameter 13 mm. A narrow groove descends on the front face; 

 a broad one occupies the hinder face. Of Elephas colunibi there 

 are present about 13 enamel plates of the rear of a tooth, but no 

 fragment has more than 4 plates. One plate is 195 mm. high and 

 95 mm. wide. Apparently there were 7 plates in a 100-min. line. 



The remaining species require more extended treatment. 



GLYPTODON PETALIFERUS Cope 



Plate 1, fig. 1; plate 2, fig. 3 



The following arc the parts of a glyptodon included in Doctor 

 Francis' collection: Five fragments of lower jaws, three belong- 

 ;ing to right rami and two to left rami, the parts representing per- 



