144 



CHEL0NIA. 



33198 x. An anterior marginal bone, apparently the third of the 

 {Fig.) right side ; from the Upper Eocene (Lower Oligocene) of 

 Hordwell, Hampshire. The general contour of this spe- 

 cimen (fig. 34) agrees closely with the third right mar- 

 ginal of the type carapace of A. ornata figured by Leidy 

 in the ' Rep. U. S. Geol. Surv. Terrs.' vol. i. pt. i. pi. xvi. 

 fig. 2 (1873), but is relatively longer. In point of size it 

 agrees more nearly with the marginals of A. radiolina 

 figured by Cope in vol. iii. pi. xviii. figs. 18, 19, of the 

 same publication, the transverse section being of pre- 

 cisely the same type. The inner surface of the bone is 

 devoid of sculpture ; and the sculpture on the outer sur- 

 face appears to form more distinct lines than in the type 

 species. Hastings Collection. Purchased, 1855. 



Fig. 35. 



Anostira anglica. — An anterior 

 marginal ; from the Hord- 

 well Beds, f . 



Anostira anglica. — The left xiphi- 

 plastral ; from Hordwell. £. 



33198 y. The left xiphiplastral, wanting a fragment of the distal 

 (Fig.) extremity; from Hordwell. This specimen (fig. 35) is 

 the type, and agrees closely in contour with the imperfect 

 xiphiplastral of the typical species, showing the some- 

 what oblique line of suture with the hypoplastral charac- 

 teristic of Anostira as distinct from Pseudotrionyx. There 

 is no trace of any sulci for epidermal shields on the outer 

 surface. Tho inner surface shows the absence of any 



