18 CHELONIA. 



30403. A series of associated bones, said to belong to the same 

 {Fig.) individual as No. R. 1433. Figured by Owen, op. cit. 

 pi. xix. These specimens comprise the left hypoplastral 

 and outer portion of the hyoplastral, the ento- and 

 epiplastrals, a cervical vertebra, the pectoral girdle, an 

 ilium, the right femur, and a terminal phalangeal. The 

 entoplastral has no sculptured callosity. 



Hastings Collection. 



Trionyx planus, Owen \ 



Known only by the posterior half of the carapace, and perhaps 

 part of the plastron. Sculpture very coarse. Fifth and sixth 

 neurals very narrow ; eighth costal more expanded than in any 

 of the preceding species. 



The absence of the seventh neural in the type is an individual 

 peculiarity. 



Hah. Europe (England). 



30410 x. The posterior portion of the carapace, showing the last 

 {Fig.) four costals of either side ; from the Upper Eocene (Lower 

 Oligocene) of Hordwell, Hampshire. The type specimen ; 

 described and figured by Owen in his ' Reptilia of the 

 London Clay, &c.' pt. i. p. 58, pi. xix. c. The inner 

 portions of the fifth and sixth costals are wanting (although 

 introduced into the figure), but the sixth costals met in 

 the middle line behind the sixth neural. 



Hastings Collection. Purchased, 1855. 



30410. The imperfect posterior portion of the carapace; from 

 Hordwell. This specimen has the sculpture in a well- 

 preserved condition, and shows the greater portion of the 

 last five costals of the left side, the last right costal, and 

 the fifth, sixth, and seventh neurals. The only respect in 

 which this carapace differs from the type is in the presence 

 of the seventh neural. Hastings Collection. 



R. 922. Slab of rock showing the dorsal aspect of the imperfect 

 posterior portion of the carapace ; from Upper Eocene 

 beds at Barton, Hampshire. The last three neurals and 

 portions of the last four costals are preserved. With the 

 exception that the sculpture has been somewhat abraded, 

 this specimen agrees in all characters with the preceding. 



No history. 

 1 Reptilia of the London Clay, &c. (Mon. Pal. Soc), vol. i.pt. i.p. 58 (1849). 



