On a new Species of Dwarf Polio. 337 



V.n-m SP W 'f Ac( \' ,ostola ™ n °*« was first established by 

 Veinl . Hertwig, however, m 187.;, described specimen, as 

 Dysaetis crasstcornts. At first it was doubtful as' to whether 

 -" / ""/' " val '"^ u:,s «*entica] with Dyactis crassieornis 

 or not j but m 1888 McMurrich described a specfmen a 

 A c«/ «r and found that it possessed many important 

 characters described tor D. crassieornis. He therefore prov] 

 that his specimen was identical with Hertwig's Dysaetis 

 c^corms but ultimately decided to adopt \Yn-iIl'/ lian e 

 in its entirety and call ,t Actinoslola callosa. This Falkland 

 specimen possessing important characters common to both 

 McMurnch s Actinoslola and to Hertwig's Dysaetis crassi 

 -■^proves further that these fonnsWg to ^thesame 



(I should like to thank Mr. F. S. Wright of this College 

 tor his help m preparing- rig. 1.) ^ouc e 



Bibliography. 

 [1] Report on Acting collected by United States Fish Commission 



^M™;^ atross during winter i887 - 1888 - bTj p 



[z] Report on Scientific Results of Voyage of the < Challenger,' 1873- 

 r,l -p * VoL vi. Actmaria. By 11. Hertwio. ° ' 



[3] Report on Scientific Results of Voyage of the ' Challenger,' 1873- 

 1876. Vol. xxvi. Supplement to Actinaria. By 11. Hertwig 



XL VI.— A new Species of Divarf Potto. 

 By Oldfield Thomas. 



(Publish,,! by permission of the Trusteea of the British Museum.) 



Arctocebus ruficeps, sp. 11. 



Near A. aureus, but the body speckled grey-brown instead 

 or rufous. 



General characters as in A. aureus, agreeing with that 

 species 111 all the points in which it differs from A. calabur- 

 ensis. Fur thick, close, and woolly. Head golden rufous, as 

 mA. aureus, though a little darker, but the body, instead of 

 being also uniformly rufous, is a dark grizzled greyish, 

 brown colour, more like some of the ordinary Pottos. Of 

 the wool-hairs the basal three-fourths are slaty, the ends 

 being brown (" sunff-brown," Ridgway). The longer hairs 

 have a subterminal band of black, their tips being white 

 these giving a speckled appearance to the general colour' 



