PLA.GUAULACTDJE. 197 



Plagiaulax becklesi, Falconer l . 



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. 



Hob. England. 



Fig. 31. 



\Plagiaulax becklesi. 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 Hesozoic 

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

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

 pi. xxxviii. figs. 1-5. Beckles Collection. 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. Sams history, 



1 Quart. Journ. Geol. Soc. vol. xiii. p. 262 (1857). 



