SKULL AXD OTHER BONES OF LOXOMMA ALLMANNI. 213 



across at their bases. The first is placed an inch from the an- 

 terior end, upon the eminence already noticed as existing on the 

 alveolar border ; a single small tooth exists in front of this. The 

 second large tooth is two inches further back, and the third one 

 inch and one-eighth behind the second; the third is therefore 

 three inches and one-eighth behind the first ; but the apices of 

 these two are four inches and a quarter apart, a distance very 

 nearly corresponding to that between the depressions behind the 

 vomerine and last palatal teeth of the maxilla. No interdental 

 depressions are visible on this exterior surface. The smaller 

 teeth vary from three-eighths of an inch to about three-quarters 

 of an inch in length. 



The left half -mandible, (Plate III., fig. 3 represents half the 

 natural size of the fragment, ) has been crushed, and the posterior 

 part broken off and lost. The greater part, however, nine inches 

 in length, the anterior end, remains in a good state (see Yol. 

 IV. " Nat. Hist. Trans, of Northumberland and Durham," 1872, 

 p. 392). 



This fragment shows both inner and outer surfaces, and con- 

 tains twelve teeth, of which three only are large ; several gaps 

 exist in the row, the teeth being irregularly placed. 



The teeth as seen from the outer surface are, with one excep- 

 tion, broken off on a level with the outer alveolar border ; but 

 if we look at the inner surface, the alveolar border there is found 

 to lie at a much lower level than the outer, forming an irregular 

 undulating line seven inches in length along the jaw, extending 

 from the front of the third tooth backwards to the fractured end ; 

 it descends gradually towards the middle of the jaw, and then 

 similarly rises, approximating to the level of the outer border. 

 This deficiency of the inner border, which at first looks like a 

 fracture, exposes the inner surface of the teeth as far as to near 

 their roots, and the depressions between the teeth appear as if in 

 section. 



The exposed surfaces of the teeth arc closely invested, how- 

 ever, by a thin layer of osseous tissue continuous with that 

 covering the surfaces of the depressions, and the inner alveolar 

 border has not in realitv been broken off. The tooth of this 



