MR C. FORSTKR-COOPER ON 



border and is without tlie swelling under the anterior pre- 

 molar. There is evidence, however, of a, similar swelling further 

 forwai-d whicli in this jaw is just under the mental foi-amen. 

 This point marks the beginning of the symphysis, and the lower 

 border in the region just behind the sympliysis is sharp and 

 ridge-like. There is apparently only one mental foramen instead 

 of several, but it is much larger in proportion than those of 

 JI. elatus. The diastema betw^een the incisor and anterior 

 premolar is small (circa 25 mm.), and tlie latter tooth seems to 

 have been very much reduced in size. The jaw is about half the 

 length of M. elatus, while the teeth are nearly as big, so that 



Text-figure 2. 



FhyUoiillon naricus. Fragment of mandible witli dotted outline of another 

 fragment in continuation. X i. 



the proportions are entirely difierent. The hinder part of the 

 ja w is not known, but in the fi-agments at hand there is no sign 

 of a downwardly-turned angle, though Pilgrim's figure* suggests 

 a, slight one. 



The flat lower border is a point of difference from Macro- 

 therbim rhodanicum and other forms in which this feature is 

 known, while the shortening of the anterior pfirt is a point in 

 common with M. rhoclanimi/ni and Chcdic other ium sivalense. 



The subjoined measurements show that the animal occurred in 

 tw^o sizes, which possibly represents a, sexual difference : — 



* IjOC. cit. pi. xii. fig. 4 a, 



