Oil (I voir Spfcics '/ Ainastra. !•">'•• 



witliout black intermixture ; under surface ])urc white, the 

 line of (leniarcation nut very slijir|ily ilutineil. Supraorbital 

 and postocular white spots present, but not ])articularly con- 

 spicuous; ears decidedly shorter than in J), famulus. Outer 

 side of arms and legs like body, inner white ; upper surface 

 of hands and feet white ; palms and soles wholly naked ; 

 ]iads of sole six^ as usual, but the haUucal one jammed close 

 up to the three terminal pads, the hallux itself bi;ing appa- 

 rently set on rather more distally than usual. Tail long, its 

 hairs gradually lengthening terminally into a conspicuous 

 blackish pencil, the hairs of which may attain to 13 mm. in 

 length ; brown above, darkening on the pencil to black, dull 

 lawn below proximally, the terminal half dark all round. 



Skull conspicuously smaller than that of JJ. famuJas, tlic 

 biilhu also smaller in proportion and less elongated anteriorly. 

 Teeth with the characteristic JJipodillus pattern, the middle 

 ii.ner lobe of vi^ half anterior to the outer lobe. 



Dimensions of the type (measured in the flesh) : — 



Head and body 78 mm. ; tail 138; hind foot 24; ear 1-). 



Skull: greatest length 27; basilar length 19'G; nasals, 

 length 10; interorbital breadth 4*8; breadth of brain-case 

 12'6; diastema 7; length of bulla 10; length of upper molar 

 series 36. 



Ilab. AVady Alagi, Eastern Egyptian desert, hit 22^^ N., 

 long. 35° E. Alt. 2000 feet. 



Ti/pe. Adult female. Original number 35. Collected 9th 

 OctoCer, 1903. Four specimens. 



This very pretty pencil-tailed gerbille is quite unlike any- 

 thing hitherto described from Egypt, its nearest ally appearing 

 to be the much larger IJ. famulus of Aden. 



XX\'. — On n ncxo Species r;/' Amastra /'/'0/« the Ilaicdiida 

 Islands. By E. li. Sykes, B.A. 



Atnaslra (^Kauaia) rex^ sp. n. 



Shell much depressed, heliciform ; umbilicus deep, of 

 moderate size ; dark horn-colour, strongly rugoselv striated, 

 with a fairly large protoconch ; whorls five, increasing 

 regularly, ])lano-conve.K, the suture being impressed and 

 well markeil ; the last whorl is carinate, flattened above 

 and somewhat inflated at the base; at the peri])hery the pori- 

 ostracum is exaggerated into a produced layiT, from which 



