CHARACTERS OF SCARTURUS AND OTHER JERBOAS. 



679 



distinguish the skull of Scartiorics from that of AUaciaga, unless it 

 be the lesser prominence of the incisor teeth and the presence of 



Text-fiofure 37. 



A. Skull of Scarturvs tetradactt/lus, from the side. 



B. The same, from below. The molar teeth which were out of the skull 



are diagrammatically represented. 



C. The same, from above. 



a longish median process projecting backwards from the palate 

 over the mesopterygoid fossa, a character observed in the one 

 skvill of S'carturus examined. 



The Oemis Scirtopoda Brandt. 



In his selections of the type-species for some of the genera and 

 subgenera introduced into the family Jaculidse by the older 

 authors, Thomas cited Diptos maiiritanict(jS Duv. as the typical 

 representative of Brandt's genus Scirtopoda and also of its sub- 

 genus Ealtomys (Ann. Mag. Nat. Hist. (8) ii. p. 308, 1908). He 

 also stated that 'maiiritanicus is identical with or closely allied to 

 the large Egyptian Jerboa described by Olivier as Jacidus gerhoa, 

 the species quoted as Jacidus orientalis in the preceding pages of 

 this paper. Except that the eai's are relatively and the bodily size 

 actually larger in this species than in Jacidus jacidus and the 



