456 



THE VEKTEBEATE SKELETON. 



are flattened below, and each bears a large horny tooth, which 

 meets a corresponding structure borne on a surface near the 

 middle of the mandible. The mandible is considerably stouter 

 than in Echidna, but the angle and coronoid process are but 

 little developed. The infra-orbital foramen and the inferior 

 dental and mental foramina of the mandible are all very large. 



Fro. 90. HALF FKONT viEW 1 OF THE SKULLS OF A TASMANIAN WOLF (Thy- 

 lacinus cynocephalus) (to the left) x f ; AND OF A HAIKY-NOSED 

 WOMBAT (Phascolomys latifrons) (to the right) xf. (Camb. Mus.) 



7. coronoid process of the man- 



dible. 



8. lachrymal foramen. 



i. 1. first upper incisor. 

 C. canine. 



premaxilla. 



nasal. 



frontal. 



infra-orbital foramen. 



lachrymal. 



jugal. 



MARSUPIALIA. The skulls of the various types of the 

 Marsupials frequently bear a strong superficial resemblance to 

 those of some of the different groups of placental mammals. 

 Thus the skull of the Dasyuridae resembles that of the Carni- 

 vora, the resemblance being most marked between the skulls of 



1 The figure was drawn from a photograph and the size of the jaws 

 relatively to the cranium is exaggerated. 



