12 ARKIV PÖR ZOOLOGI. BAND 12. N:0 13. 



Breadth across m^ (anteriorly) 52,6 mm 



» » alveoles of c 29,5 » 



m 



46 



» » p^ 28,3 



Front of canine to back of m^ 64 



Length of p^ 15,2 



> j> m^ 10,4 



Breadth » » 13,3 



Length of m' 5,5 



Breadth » » 9 



Length of npper molar series 51 



Length of m^ . . . . , 16,5 



» » w?2 6,7 



» ^3 4,2 



Length of mandible from condyle to front of symphysis .... 108,3 



Length of humerus 105 mm 



» » ulna 125 » 



» » femur 132 » 



» » tibia 139 » 



A comparison between the skull of the Yaghan dog and 

 skulls of Pseudalopex lycoides Phil. proves, however, at the 

 first look, that there is no affinity between these two animals, 

 and the Yaghan dog has thus been imported to Tierra del 

 Fuego. The cranial dimensions of the Yaghan dog are found 

 on the adjoined table of measurements. From the same is 

 to be seen, that the dog skull is very much smaller than 

 that of Ps. lycoides, and even somewhat smaller than Ps. 

 magellanicus, with shorter and broader snout. But there 

 are many other differences which not are demonstrated by 

 the measurements alone. Such are the strongly concave 

 profile of the preorbital portion of the skull in the Yaghan 

 dog. The lower jaw of the same is curved in such a way 

 that especially its lower profile contour is strongly convex. 

 This manifests itself very plainly if the mandible is put on 

 a table, because it can then by a slight push be kept 

 rocking like a cradle for a good while, whereas the mandible 

 of f. i. Ps. lycoides with its straight lower side does not 

 react in such a way. The occipital area of the Yaghan dog 



