MARSUPIALIA 



23 



Tritijlodon Owen (Fig. 27). According to Broom, this genus belongs to the 

 Allotheria {Mtdtituherculata). Karoo formation of South Africa. 



Fig. 27. 



Tritylodon longaevus Owen. Triassic of Basutoland. Sknll from above and below. 2^3. (After Owen.) 



Trighjphus Fraas. Known only by minute quadrangular teeth with two or 

 three rows of tubercles. Rhaetic Bonebed of Hohenheim near Stuttgart. 



Family 2. Plagiaulacidae Gill. 



Premaxillanj with one to three I, mandible with one I. First I, in loth jaws 

 rodent-like. Upper P with three to five tubercles, the hindermost frequently with more. 

 Lower P laterally compressed, trenchant ivith jagged edges. Lower M with two, 

 upper with three rows of tubercles ; rarely only two rows present in upper M. Lower 

 jaw less elongated than the upper. The articular condyle extends as far as the 

 inflected angle. Rhaetic ; Europe. Jurassic to Eocene ; Europe and North 

 America. 



Microlestes Plieninger {Hypsiprymnopsis Dawkins) 



Fig 29 

 Microlestes antiquiis Plieninger. 



Molar from the Bonebed of Ech- Plagiaulax hecklesi Fale. Purbeck beds of Swanage, Dorsetshire. 



terdingen, Wiirttemberg. 3/i. A, Lower jaw, i/i- -B, -PZaj/iawiaa; minor Owen, from the same locality. 



a, molar enlarged ; b, lower jaw enlarged ; c, the same, i/j. (After 



Falconer.) 



(Fig. 28). Known only by small, elongated quadrangular teeth, excavated 



in the middle and with tubercles along the inner and outer margins. Rhaetic 



Bonebed of Wiirttemberg and Somersetshire. 



2.0.3.4. 

 Plagiaulax Falconer {Bolodon Owen) (Figs. 29, 30). ^^K~W'^~7^■ Mandible 



