142 CHELONIA. 



48349. Slabs of limestone, containing numerous fragments of the 

 carapace and plastron, together with part of the pelvis ; 

 from the Middle Purbeck of Durdlestone Bay, near 

 Swanage. The portions of the shell are too broken to 

 afford any characters of importance ; but the distal portion 

 of a pubis, apparently of the right side, is noteworthy. 

 This bone, which is noticed on p. 274 of the memoir cited, 

 is of rather peculiar shape, owing to the great elongation 

 and distal expansion of the inner or symphysial branch ; 

 it is intact and shows that the extremity of the outer 

 branch was thin and compressed, and had no anchylosis 

 with the plastron. Beckles Collection. Purchased, 187(3. 



48352. Slab of limestone, showing the internal surface of part of 

 two costal bones, and the glenoidal extremity of the 

 scapulo-precoracoid ; from Durdlestone Bay. This spe- 

 cimen may have belonged to the same individual as the 

 last. This bone has a long neck above the glenoid cavity, 

 in which respect it differs from Chelydra, and resembles 

 many Pleurodira, such as Chelodina. Beckles Collection. 



48325. The right hyoplastral embedded in a slab of rock with the 

 outer surface exposed ; from the Purbeck of Swanage, 

 Dorsetshire. Noticed by Boulenger and the present 

 writer, op. tit. p. 273 ; it shows the sulcus between the 

 gular and pectoral shields, and also the one between 

 the pectoral and the marginal and axillary shields. The 

 denticulated surface for articulation with the carapace is 

 well displayed. In essential characters this specimen 

 agrees very closely with the corresponding element of 

 No. R. 171, although the axillary notch is relatively 

 wider — a difference which maybe merely of sexual value. 

 The articular surface for the entoplastral accords well 

 with the entoplastral of No. E. 171. 



Cunnington Collection. Purchased, 1875. 



R. 171 x. Part of the left epiplastral: from the Wealden of the 

 Isle of Wight. This specimen has a more curved contour 

 than the epiplastral of T. bakeivelli, but the contour of the 

 epidermal shields is not shown. Fox Collection. 



R. 171 y. An imperfect left hypoplastral ; from the Isle of Wight. 

 Is indistinguishable from the corresponding element of 

 No. R. 171. Fo.r Collation. 



