On the Skull, Brain, d'c. of Diademodon. 217 



Dimensions of the type (measured on the spirit-speci- 

 men) : — 



Head and body 97 mm. ; tail 109 ; hind foot 24 ; ear 16. 



Skull: greatest length 30; condylo-incisive length 27; 

 zygomatic breadth 15; nasals 10; interorbital breadth 4'7 ; 

 palatilar length 12*7 ; palatal foramina 4*9 j upper molar 

 series 5*2. 



Ilab. Murray Islands, Torres Straits. Type from Mer. 



Type. Adult female. B.M. no. 09. 9. 10. 3. Collected 

 and presented by Prof. A. C Haddon. Another specimen 

 collected by the lie v. S. MacFarlane. 



Uromys muscalis, sp. n. 



A small species with white belly anl very small teeth. 



External characters as in U. murium, though the colour is 

 rather less strongly fulvous. The specimens of both have 

 been skinned out of alcohol, but it is not possible to say if 

 they have been equally affected by it. Under surface and 

 inner side of limbs wholly white. Tail brown above, lighter 

 below ; scale-rings about fifteen to the centimetre. 



Skull smaller and more delicately built than in murinus ; 

 supraorbital edges sharply defined in the type, which is aged. 

 Palatal foramina quite short, ending nearly half their length 

 in front of the molars. Teeth very small, conspicuously 

 smaller than in any other species. 



Dimensions of the type (measured on the spirit-speci- 

 men) : — 



Head and body 95 mm. ; tail 105; hind foot 22; ear 14. 



Skull : greatest length 29 ; condylo-incisive length 26 G ; 

 zygomatic breadth 14*5 ; nasals 10'2 ; interorbital breadth 

 4*1; mastoid breadth 11; palatilar length 124; palatal 

 foramina 4 ; upper molar series 4" 7. 



Hob. Lower Fly River, British New Guinea. 



Type. Old male. B.M. no. 86. 5. 16. 4. Collected by the 

 Rev. S. MacFarlane. Three specimens. 



Distinguishable by its small size and extremely small 

 teeth. 



XXV. — Further Notes on the Skull, Brain, and Organs of 

 Special Sense of Diademodon. By D. M. S. Watson, 

 M.Sc.j Lecturer in Vertebrate Palaeontology in University 

 College, London. 



Whilst collecting on the farm Winnaarsbaaken, District 



Albert, Cape Colony, which 1 visited with the aid of a grant 

 from the Percy Sladen Trustees, 1 obtained the back of a 

 Ann. & Mag. N. Hist. Ser. 8. Vol. :cii. 10 



