252 Mr. W. E. de Winton on 



across botli bones 5'5 ; across interorbital space at suture of 

 lachrymals and frontals 18; intertenijioral constriction 14"6 ; 

 infraorbital foramen, height 6*5, breadth 3*7, basal length 51 ; 

 molar series 13; diastema 12; mandible, length (bone only), 

 back of incisors to condyle 33'5, to angle 35, to coronoid 29; 

 height, standing on table, perpendicularly to coronoid 19, to 

 condyle 17"1. 



Compared with the skull of A. cinereus (measurements of 

 which, so far as it is possible, are given below), the maxillary 

 processes of the zygomata do not spring out so abruptly, the 

 supraorbital ledges slightly and gradually narrow poste- 

 riorly, with less distinct processes in the temporal portion ; 

 the nasals are rather longer; the posterior portions of the 

 nasals, premaxillary and maxillary processes being subequal 

 in breadth and evenly rounded off, the frontal suture forms a 

 row of even scallops; the lachrymal bones are rather longer 

 on the frontal surface, the infraorbital foramina are smaller, 

 the molars broader and more rounded, and the incisive 

 foramina smaller. The auditory bullee are rather large. 



A. cinereus^ Thos. — Very few measurements are possible, 

 the skull being very imperfect. Length of nasals 13 millim. ; 

 narrowest breadth 5*7 ; interorbital breadth 16"5 ; inter- 

 temporal constriction 15; infraorbital foramen 6'7x4'2; 

 molar series 13; diastema 12; mandible, inner side of back 

 of incisors to condyle 33, to coronoid 26, to angle 33*5. 



Nasals short ; supraorbital ledges not converging from the 

 front, ending posteriorly in well-marked processes; zygomata 

 springing out very abruptly in front ; tiie nasals, which are 

 blunt, barely reach back as far as do the processes of the pre- 

 maxillse, and are not quite so broad as these processes, so that 

 the frontal suture has not the scalloped appearance which is 

 so striking a feature in A. Jacksoni. 



As some of the outward characters of this new Anomalurus 

 resemble A. erythronotus^ it would be well to mention the 

 most striking difierences between the skulls. The new form 

 differs in the maxillary portion of the zygomata being stronger 

 and the infraorbital foramina smaller ; in the longer and 

 narrower processes of the premaxillse, which in A. erythronotus 

 stop considerably short of the back of the nasals ; in the less- 

 developed processes terminating the frontal ledges ; the 

 auditory bullae are considerably larger and rounder ; the 

 molar series longer and the teeth much heavier. The single 

 specimen has no free pterygoid processes, the bones show 

 no sign of fracture, being smoothly rounded off. In the 



