76 FOSSIL REPTILIA OF THE LONDON CLAY. 



Such are the meagre details to which we are restricted in describing by far the 

 largest of all the fossil species of this genus. I have the gratification of offering it by- 

 name to my distinguished friend Sir Henry De la Beche, through whose kindness I 

 have the opportunity of including it in the present Monograph. 



T. B. 



FRAGMENTARY REMAINS OF EMYDIANS. 



Emys crassus. Tab. XXVII. 



From several such specimens kindly transmitted to me by the Marchioness of 

 Hastings, I have selected for the subjects of Tab. XXVII two portions of a plastron; 

 viz. the hyosternal (figs. 1, 1') and the hyposternal (figs. 2, 2'). They are chiefly 

 remarkable for their thickness (fig. 3), and also for their size in other dimensions. 



The hyosternal shows on its outer surface (fig. 1) very strong impressions of the 

 interspace or union between the humeral and pectoral scutes, and between the pectoral 

 and abdominal scutes. The hyposternal shows the same kind of impression between 

 the abdominal and femoral scutes. 



These specimens were discovered in the Eocene sand at Hordwell, and are in the 

 museum of the Marchioness of Hastings. 



In Tab. XXIV, figs. 1 — 5, are figured some portions of the carapace of an Emys, 

 from the Eocene deposits on the north shore of the Isle of Wight. These also form 

 part of the collection of the Marchioness of Hastings. 



PRINTED By C. ANU J. ADLAKD, BARTHOLOMEW CL03E. 



