388 Mr. F. A. Bather on 



Under surface essentially as in A. aureus, but the grey bases 

 of the hairs more extended, so that the general colour is 

 darker, and there are not even the whitish patches on the 

 throat and inguinal region. Limbs bright rich rufous. 

 Tail dark rufous, a small brown spot at the end of its 

 terminal hairs. 



Skull essentially as in A. aureus. Nasals comparatively 

 short, ending posteriorly opposite the lacrymal foramina. 

 Upper incisors narrow and far apart, as in A. aureus, as 

 compared to the somewhat broader ones of A. calabarensis. 

 Posterior premolars without any trace of the distinct hypo- 

 cone present in the type of A. aureus, but with only one 

 specimen of each species available no opinion can be ex- 

 pressed as to the validity of the character. 



Dimensions of the type-skull (somewhat immature) : — 



Greatest length 50 mm. ; condylo-basal length 475 ; 

 greatest breadth 27*2 ; nasals 10 6; interorbital breadth 5 ; 

 mastoid breadth 26*5 ; palatal length 20 ; front of canine to 

 back of m 3 17. 



Hah. Metet, near the Nvong "R., S. Cameroons. 



Type. Subadult female. B.M. no 13. 9. 12. 1. Ori- 

 ginal number 645. Collected 17th January, 1913, by 

 Mr. G. L. Bates. 



" Caught near Metet and brought tome alive. It died on 

 the journey, and was skinned." — G. L. B. 



This pretty little Potto is evidently most closely allied to 

 A. aureus, also discovered by Mr. Bates, but differs by its 

 darker and grey-grizzled upper surface, the darker colour of 

 its belly, and (if a permanent character) by the absence of a 

 hypocone on its posterior premolars. 



From A. calabarensis, like A. aureus, it differs by its more 

 lightly built skull, its slender incisors more widely separated 

 mesial ly, its swollen teeth, and compressed lower premolars. 



XLVII. — British Fossil Cricoids. — IX. Cydonocvinus 

 parvulus, n. q. et sp. } Yorcdale Beds, Yorkshire. By F. A. 



Bather, F.B.S. 



(Published by permission of the Trustees of the British Museum.) 



The specimen which it is the object of this paper to desciibe 

 belongs to the Crinoidea Dicyclica Flexibilia, and, with all 

 the Pala?ozoic members of that Order, it falls into the Grade 

 Impinnata. More precisely, it is one of the Taxocrinidfe ; 



