112 CHELONIA. 



38102. The right epiplastral of an adult individual, probably re- 

 (Fig.) ferable to this species. Figured by Owen, oj>. cit. pi. 

 xxxvi. fig. 5 (without name), as a posterior marginal. In 

 the absence of any distinct elevation of that part of the 

 dorsal surface which is covered by shields above the 

 general surface, this specimen agrees with the existing 

 Ocadia. The specimen indicates a slightly smaller indi- 

 vidual than that to which the type hyoplastral belonged. 



Hastings Collection. 



R. 1573. A left epiplastral, agreeing in size with the preceding. 



Hastings Collection. 



R. 1574. A right epiplastral, of nearly the same size. The surface 

 for the hyoplastral is unusually short, and the specimen 

 may belong to the next species. Hastings Collection. 



R. 1575. The entoplastral. This specimen agrees with the ento- 

 plastral of No. 32349 in being traversed by the humero- 

 pectoral sulcus, and thereby differs from the corresponding 

 bone of the type of Emys hordwelliensis. 



Hastings Collection, 



R. 1576. An entoplastral which appears to have been flattened by 

 pressure. The humero-pectoral sulcus in this specimen 

 only just impinges on the inferior angle, thus showing 

 that very little importance can be attached to its position. 



Hastings Collection. 



30410 a. The right hyoplastral of an adult individual. The type 

 (Fig.) specimen ; figured by Owen in his ' Reptilia of the London 

 Clay, &c.' vol. i. pi. xxvii. fig. 1, reversed (incorrectly 

 termed the left hyposternal in the description of the plate). 

 This specimen is mentioned by Seeley on p. 450 of vol. 

 xxxii. of the ' Quart. Journ. Geol. Soc.,' where it is stated 

 to differ in the contour of the anterior extremity and the 

 position of the sulci from the corresponding bone of the type 

 plastron of Emys Jiordwelliensis, figured on p. 449 of the 

 same volume. A comparison with the figure shows, how- 

 ever, that the two specimens are practically identical in 

 these respects. In both the humero-pectoral sulcus does 

 not impinge on to the entoplastral. The relative width of 

 the latter bone in the present example is shown by the 

 contour of its notch. Hastings Collection. 



