TBJONYCHID^I. 21 



Some or all of the following specimens from BracJclesham 

 may belong to this species. 



38962. An imperfect eighth cervical vertebra belonging to a large 

 individual. Bowerbanh Collection. 



33237. The arch of a cervical vertebra. 



Hastings Collection. Purchased, 1855. 



38999. A sacral vertebra. Bowerbank Collection. 



38968. A left humerus, imperfect at the two extremities. 



Bowerbanh Collection. 



R. 1431. A right humerus. No history, 



Trionyx, sp. 



The undermentioned specimen differs from T. pustulatus, Owen, 

 from the same deposits, in the nature of the sculpture. 

 Rah. Europe (England). 



33303. The imperfect distal extremity of a costal ; from the London 

 Clay (Lower Eocene) of the Isle of Sheppy. 



Purchased. About 1858. 



Trionyx vittatus, Pomel \ 



Of very large size, approaching the dimensions of Chitra inclica. 

 Sculpture very coarse, in the form of short and irregular ridges ; 

 absent on the greater portion of the nuchal, and from the distal 

 part of the costals. 



Rah. Europe (France). 



8775. Part of the distal extremity of a costal, with a fragment of 

 another costal attached ; from the Lower Eocene of L'Oise, 

 France. This specimen agrees with the costals of the 

 carapace figured by Gervais in his 4 Z.ool. et Pal. Fran- 

 chises,' pi. lii., in which the antero-posterior diameter of 

 the third costal is 0,115 (4-53 inches). All the known 

 specimens are from the same deposits. 



Mantell Collection. Purchased, 1838. 



Trionyx, sp. 



Hob. Africa. 



R. 52. The imperfect distal portion of a costal bone ; from beds of 

 unknown (? Tertiary) age at Chalon, in the Arabian 



1 Arch. Sci. Phys. Nat. vol. iv. p. 328 (1847). 



