MASTODON ANGUSTIDENS. 69 



minute mammilla, as in Schinz's figures. It is from the lignite of 

 Kcepfaacn, and is black. 



Length of crown, 4-4 in. Width of crown, 1st. ridge, 27 in. Width of crown, 

 2nd ridge, 3'1 in. Width of crown, last ridge, 2-9 in. Height of crown (about) 

 1-7 in. 



The internal basal bourrelet is very strongly developed. 



2nd. Examined the original of the lower jaw, young specimen from 

 Buchberg, which is exceedingly interesting from showing the germ of 

 a vertical dent de remplacement in front of the worn 3rd milk molar. 

 It is of the right side, showing the horizontal ramus nearly entire, 

 (except at the posterior angle), and the ascending ramus. The leafy 

 expansion is exhibited, but the condyle and coronoid are broken off. 

 Two exserted teeth are seen in the horizontal ramus, and one behind ; 

 an included germ is disclosed by a lateral breach of the alveolar cavity 

 on the inner side. 



The posterior protruded molar is the third milk molar, of which the 

 greater part of the crown is broken off, showing only the anterior ridge, 

 nearly entire, and the posterior talon intact. The anterior ridge is 

 only slightly touched by wear. It shows a very marked anterior 

 disc of pressure, and the accessory mamnriLke behind interrupting the 

 valley. 



Length of crown, 2-8 in. Width of crown at 1st ridge, 1-4 in. 



Of the penultimate milk molar a small portion remains posteriorly, 

 the great mass of it having been extruded by the germ of the cor- 

 responding vertical successional premolar, which is seen considerably 

 protruding, but much below the level of the 3rd milk molar, and 

 quite intact and in germ, indicating its nature ; only the last ridge 

 remains, showing complex converging minute mammilla?, very different 

 from the transverse character of the ridges of Mast. Tapiroides. The 

 cast of the shell remains, indicating a length, including fang, of about 

 2 inches, by a width of about 1/2 inches. 



Behind the 3rd milk molar is seen the shell of the 1st or antepen- 

 ultimate true molar, showing three ridges and a heel, but not sufficiently 

 disclosed for description, except that the inner tubercle of each ridge 

 is blunt and rounded (the M. angustidens character), and not trenchant. 



The anterior part of the jaw is broken off, giving no hint as to the 

 form of the symphysis. 



3rd. Examined also a superb undescribed specimen of the penultimate 

 and last molars of the lower jaw left side, of the same species, adhering 

 together, but retaining no portion of the jaw. The anterior tooth is 

 well worn on the three ridges, but the anterior ridge only has its points 

 worn down into one common disc. The discs are simple in their out- 

 line, and very much like those of figs. 9 and 9 a of M. angustidens in 

 Plate XL. of the ' Fauna Antiqua Sival.,' but less touched by wear. 

 The greatest difference is in the talon (posterior) which has one large 

 point with numerous crenulated points forming a small transverse ridge. 

 The intermediate mammillae are exactly as in fig. 9 a of the ' Fauna 

 Antiq. Sival.' ; there is no basal ridge. The tooth in form of crown 

 is less cucumber-shaped than usual. 



Length of crown, 4-8 in. With at 1st ridge, 2-35 in. Widtb at 2nd ridge, 275 in. 

 Width at 3rd ridge, 3 - in. 



The lateral outline of the crown, seen from above, forms salient pro- 

 jections, and re-entering hollows causing constrictions. 



