PLETJROSTERXnxa:. 213 



completely separate the hyo- and hypoplastrals. The 

 intergular shield does not extend on to the entoplastral, as 

 it does in adult examples. The slab also shows the three 

 anterior marginals of one side, the first of which agrees 

 with the corresponding bone in No. 48262 ; and a scapulo- 

 precoracoid. BecMes Collection. 



48346. Slab exhibiting the dorsal aspect of the right hyoplastral of 

 an individual of somewhat larger size than No. 48347 ; 

 from Durdlestone Bay. BecMes Collection. 



48283 C. Slab showing the dorsal aspect of the imperfect carapace of 

 a very young individual ; from Durdlestone Bay. The 

 component bones are dislocated, the posterior extremity is 

 wanting, and the nuchal is imperfect. The areas of the 

 first three vertebral shields (which are relatively wider 

 than in No. 4S262) are shown ; and the nuchal and neural 

 bones are traversed by a median sulcus, which apparently 

 indicates that the vertebral shields were divided. 



Becldes Collection. 



48263 a. Slab showing the dorsal aspect of a similar imperfect cara- 

 pace ; from Durdlestone Bay. The vertebral shields ap- 

 pear relatively shorter than in the preceding specimen, 

 but this is owing to the circumstance that the bones are 

 not dislocated. The nuchal is wanting. 



BecMes Collection. 



48263 e. Slab showing an imperfect carapace and plastron agreeing 

 in size with the preceding specimen ; from Durdlestone 

 Bay. The ridged sculpture characteristic of very young 

 individuals is more marked than in the preceding spe- 

 cimens. BecMes Collection. 



48344. Slab exhibiting the ventral surfaee of an imperfect plastron, 

 together with some costal bones, of an individual agreeing 

 in size with the preceding. The mesoplastral is well 

 shown. BecMes Collection. 



48351. Slab showing the dorsal surface of the right scapulo-preco- 

 racoid ; from Swanage. This specimen precisely agrees 

 with the corresponding bone in No. 38733, but shows the 

 marked pedunculation of the glenoid cavity. 



BecMes Collection. 



R. 923. Slab exhibiting the ventral aspect of the left scapulo-pre- 

 coracoid ; from Swanage. No history. 



