Geological Society. 445 



The tusks, judging from the alveoli, must have been of equal vo- 

 lume with those of the largest living elephant. 



The following is the measurement of some of the remains of M. 

 latidens. 



Extreme breadth of fragment of cranium (upper jaw 



with the greatest part of both grinders) 1 Ft. 3 In. 



Length of ditto I 8 



Extreme length of right anterior grinder (6 denticuli 



and the spur) 8^ 



Extreme breadth at third denticulus 4 



Circumference of lower jaw, measured over the grind- 

 ing surface of the tooth 2 4 



Extreme length of tooth 1 If 



Extreme breadth 4± 



Circumference of the lower extremity of right femur 2 2 



Same, round the condyles 2 4 



Mastodon elephantoides. — M. dentibus latis j denticulis numerosis, 

 compressis. 



This species must have been smaller than the last. There is a fine 

 example of the lower jaw, showing the tooth in the highest degree 

 of perfection. The tooth is 11 inches long and 3j inches broad, 

 has no less than ten denticules, and each of these denticules is ma- 

 millated with small points 5 five being the smallest, and eight the 

 greatest number on any one denticule. In front of this tooth is 

 seen the remnant of the preceding one, worn down and disappear- 

 ing j and behind it is the cavity wherein the young tooth, intended 

 as a successor to that in existence, was in the course of formation. 

 The denticules are much more compressed than those in the species 

 last described j they are closer together, and the whole tooth ap- 

 proaches still more nearly to that of the elephant, while the jaw is in 

 unison with the appearance of the tooth. 



Pachydermata ordinaria. — In this group we have the remains of 

 the genera Sus, Hippopotamus, and Rhinoceros. Of the first there 

 is only a single specimen, consisting of a small' portion of the lower 

 jaw, containing one molar tooth and the fragment of another. Of 

 the second there are but few fragments, nor are they sufficiently cha- 

 racteristic to warrant a definition of the species, which must have been 

 comparatively small. Of the third there is a portion of the upper 

 jaw, containing two molar teeth ; and portions of the lower jaw with 

 molares, which seem to approach nearer to those of the rhinoceros 

 of Java than to those of any other living species. 



Ruminantia. — In this group we have fragments of the ox and of 

 the deer. 



Reptilia. 



Qiqlonia, Cuv. — (Testudinatq, Bell). — There are many fragments 

 of a large species of trionyx, and some of an emys. But the remains, 

 are not sufficiently defined for specific description. 



Sauria. — Fam. CrocodilicUe. — Of this family we have the remains 

 of two genera ; viz. a Leptorhynchus allied to, if not identical with, 



the 



