PLAGIAULACIDiE. 197 



Plagiaulax becklesi. Falconer \ 



This is one of the two type species, and has three lower premolars ; 

 it is of relatively large size, and characterized by the great depth of 

 the mandibular ramus, and the stoutness of the incisor. 



Rab. England. 



Fig. 31. ' 



\Plagiaidax beoklesi. — The right ramus of the mandible ; from the Middle 

 Purbeck of Swanage. f . 



47731. The right ramus of the mandible; from the Middle Purbeck 

 {Fig.) of Durdlestone Bay, Swanage, Dorsetshire. This specimen 



(woodcut fig. 31) is the type, and is described and figured 

 by Falconer in the ' Quart. Journ. Geol. Soc' vol. xiii. 

 p. 278, figs. 1-5, and by Owen in the ' British Mesozoic 

 Mammalia ' (Mon. Pal. Soc), pi. iv. figs. 10, 10 a ; it is 

 also figured in 'Falconer's Palaeontological Memoirs,' vol. ii. 

 pi. xxxviii. figs. 1-5. BecMes OolIeGtion. Purchased, 1876. 



47732. Fragment of the right ramus of the mandible, showing the 

 {Fig.) incisor and the three premolars (pm. 4 imperfect) ; from 



Durdlestone Bay. Figured by Falconer, op. cit. p. 279, 

 figs. 11-13, and by Owen, op. cit. pi. iv. figs. 13, 14. 



Same history, 



47733. Fragment of a mandibular ramus, showing the two true 

 {Fig.) molars ; from Durdlestone Bay. Figured by Falconer, 



op. cit. p. 279, figs. 7-10, and by Owen, op. cit. pi. iv. 

 fig. 12. Same history. 



47734. Fragment of the left ramus of the mandible, showing th 

 {Fig.) incisor and premolars ; from Durdlestone Bay. Figured 



by Owen, op. cit. pi. iv. fig. 15. Sam'3 history. 



^ Quart. Journ. Geol. Soc. vol. xiii. p. 2G2 (1857). 



