34 



MAMMALIA 



CLASS V 



Subfamily 4. Diplocynodontinae Marsh. 



Upper M with large protocone, lower M with broad, basin-like talonid. Jura of 

 Wyoming. 



Dicrocynodon Marsh (Diplocynodon Marsh) (Fig. 54). 



o -, A Q • Median 

 3.1.4.8. 



cone of M and F high. Coronoid process broad. Angle small. Articular 



condyle above the summits 



of teeth. 



Enneodon, Docodon 

 Marsh. 



Fig. 53. 



Fig. 54. 



Kurtodon Osborn. Upper molars en- Dicrocynodon victor Marsh. Upper Jurassic of Wyoming. Exterior 



larged. Upper Jurassic of England. aspect of right half of lower jaw. 2/j (after Marsh), a, canine ; h, 

 (After Osborn.) condyle ; c, coronoid process ; d, angle. 



Family 4. Notoryctidae Stirling. 

 Limbs specialised for digging as in moles. 

 Notorydes Stirling. Kecent in Australia. 



Family 5. Peramelidae. 



Limbs very • much specialised. Hand often fitted for digging. Fes with 

 reduced lateral toes. Recent in Australia. Represented in the Pleistocene 

 of Australia by a few fragmentary remains. 



Family 6. Dasyuridae. 



Carnivorous marsupials of moderate size. 



Predaceous Marsupials 

 3-4.1.3.4. 



/ and C normally 



3.1.3.4. 



developed. Upper M tritubercular with two outer cusps, one large inner cusp, 

 protocone, and one trenchant metastyle. HF usually very much reduced. Lower M 

 with trenchant anterior cusp, paraconid, primary cusp, protoconid, and small hollowed 

 or secodont talonid, but no metaconid. F in both jaws with single cusp, bifid root, 

 gradually becoming larger anfero-posteriorly, F^ seldom enlarged. Manus with five 

 clawed toes ; pes with five or four toes, hallux frequently reduced, sometimes wanting. 

 Angle of lower jaw inflected. 



In the case of the genera Dasyurus Geoflfr., Sarcophilus Cuv. and 

 Thylacinns Temm., Recent and also Pleistocene in Australia, only the 

 hindmost of the three F is modified. The hard palate is perforated. 



Among the following genera, found only in the Tertiary of Patagonia and 

 constituting the Sparassodonta of Ameghino, the palatal perforation is lacking 

 and C as well as two F succeeds a milk tooth. 



