;{()0 



MR C. FORSTKR-COOPER ON 



l)ordev nnd is without tbe swelling under the anterior pre- 

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

 forwai'd, which in this jaw is just under the mental foramen. 

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

 border in the region just behind the symphysis 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 

 J/. elaUis. The diastema between the incisor and anterior 

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

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

 leno-th of M. elatus, while the teeth are nearly as big, so that 



Text-figure 2. 



PhyllotiUon naricus. Fragment of maiiclible with dotted outline of anotliev 

 fragment in continuation. X i. 



the proportions are entirely different. The hinder part of the 

 jaw 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- 

 therium rhodanicum and other forms in which this feat^ure is 

 known, while the shortening of the a.nterior part is a point in 

 common with M. rhodanicum and Ghcdicotheriu'm sivalense. 



The subjoined measurements show that the animal occurred in 

 two sizes, which possibly represents a sexual difference: — 



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



