MU1UD.E. — GERBILLUS. 205 



The Gteeboa. Dipus aegyptius. 



Duvemoy, Mem. do la Soc. d'llist. Nat. do Strasbourg, ii. pi. 3. 



figs. 1-6 (skeleton and skulls). — Waterhouae, Charles-worth's Mag. 



Nat. Hist. 1839, p. 9. figs, e, d (skull). 

 Dipodes jerbose, Fischer, Prod. Cran. Comp. tab. 2. fig. 1 (skull), 1811. 

 Dipus bipes, Patuhr u. & Alton, Vergl. Osteol. taf. 7 (skeleton). 



a. Skull. Egypt. 



b. Skull. From the Zoologieal Society's Collection. 



Dipus telum. 



*a. Skull. Wolga. From Mr. Brandt's Collection. 



Dipus sagitta. 



Schreb., Siiugth. iv. p. 849. — Owen, Odont. pi. 105. fig. 7 (dentition). 

 Mus sagitta?, Pallas, Nov. Spec. Glir. p. 311. pi. 26. fig. xxv. 5 (ske- 

 leton), 1778. 



ALACTAGA. 



Teeth: — Incisors ~ ; Molars ^;=16. 



The Alactaga. Alactaga vexillaris. 



Dipus jaculus, Brandt, Mem. Acad. St. P»5tersb. vii. taf. 11. fio-s. 1-7 

 (skull). 



a, b. Skulls. Siberia. 



The Acontium. Alactaga acontium. 



Cervical vertebrae 7 



Dorsal 12 



Lumbar 7 



Sacral 4 



Caudal 25 or 26 



a. Skeleton. Siberia. 



GERBILLUS. 



Teeth : — Incisors ~± ; Molars |f| ; =16. 



The Mountain Gerhille. Gerbillus montanus. 



a. Skull. Caffraria, S. Africa. 



b. Skull. S. Africa. Presented by Sir A. Smith. 



The Slender Gerbille. Gerbillus tenuis. 

 a. Skull. S. Africa. Presented by Sir A. Smith. 



