PLEUBOSTERNIBiE. 



217 



50116. Slab showing the dorsal surface of the imperfect anterior 

 portion of the carapace ; from the Lower Kimeridgian 

 Lithographic limestone of Kelheim, Bavaria. This spe- 

 cimen shows the first four neural bones and portions of 

 the first five costals. The entire area occupied by the 

 second vertebral shield is also exhibited. Purchased, 1879. 



Pig. 48. 



Tlatychelys obemdorferi. — The dorsal aspect of the carapace ; from the 

 Lower Kimeridgian of Bavaria. {After Wagner.) 



Platychelys (?) anglica, Lydekker. 



Typically of smaller size than the preceding species ; neural bones 

 with a continuous median keel ; neurals in posterior half of carapace 

 not corresponding in antero-posterior diameter with the costals, and 

 consequently several of the neurals articulating extensively with 

 other than their corresponding costals. Prominences and hollows 

 on the carapace much less developed than in the type species, and 

 posterior border of carapace entire. 



Hob. Europe (England). 



48357. Slab showing the imperfect posterior portion of the cara- 

 (Fig.) pace ; from the Middle Purbeck of Durdlestone Bay, Dor- 



