290 



Mr. K. Andersen on the Bata 



General Remarks on the Rb. macrotis Group. 



The skull of Rh. macrotis is of the general shape charac- 

 teristic of all the more primitive species of the genus : very 

 narrow temporal fossa and low sagittal crest ; nasal swellings 

 not especially modified, the median anterior swellings but a 

 trifle larger than usual; basioccipital not more sti'ongly 

 narrowed than in the majority of species. The palatal bridge 

 is remarkuhhj long, equal to ^ or ^ of themaxillar tooth-row. 

 Dentition primitive : upper canine and /*^ widely separated ; 

 /r small (as usual), but with a distinct cusp. 



The essential external characters are the long and broad, 

 almost parallel-margined (tongue-shaped) sella; the long and 

 dense hairing on the front face of the sella; the very slightly 

 projecting, rounded connecting-process, starting from a point 

 below the summit of the sella ; the cuneate lancet ; the broad 

 horseshoe ; the three mental grooves ; the broad ears ; the 

 quite primitive wing-structure : fifth metacarpal a triHe 

 shorter than the fourth^ III.^ (as well as the other distal 

 phalanges) very short. 



Among the now existing types of the genus Rh. macrotis 

 has no closer relatives than the Rh. philippinensis group. 

 We find in this group an unusually long palatal bridge ; the 

 same tendency to enlargement of the nose-leaves ; the shaoe 

 of the sella (apart from the lateral expansions, of course) 

 strongly recalls that of macrotis ; the connecting-process is 

 broadly rounded and starting from a point below the summit 

 of the sella, as in wiflc?'o/2S ; the lancet long and cuneate; 

 the ears very much of the macrotis type ; the mental gr jovcs 



