PROTOCHELYS. 221 



All the following specimens were obtained from the Lower Jurassic 

 of Stonesfield, Oxfordshire. The first record of the occurrence of 

 a similar specimen in these deposits is given by Owen in the ' Rep. 

 Brit. Assoc' for 1841, p. 160; and the undermentioned specimens 

 include those noticed by Blake in the ' Geologist,' 1863, p. 183. 



37218. A split slab showing the impressions of the two surfaces of 

 one of the first four vertebral shields. Purchased, 1863. 



37218 a. Slab showing the impression of a somewhat larger vertebral 

 shield of the same general type. Purchased, 1863. 



R. 247- A split fragment of rock showing the impressions of the 

 two surfaces of the imperfect right half of a nearly similar 

 shield. The markings are well preserved. 



Egerton Collection. Purchased, 1882. 



R. 247 a. Fragment showing the impression of an imperfect vertebral 

 shield. Part of the left side is wanting. This specimen 

 was probably the fourth vertebral. Egerton Collection. 



37218 b. A split slab showing the impressions of the two surfaces 

 of the fifth vertebral shield. In contour this specimen 

 accords with the type vertebraJs figured by Phillips in his 

 ' Geology of Oxford,' p. 182, diagram xli. Purchased, 1863 # 



R. 247 b. A split slab showing the impressions of the two surfaces 

 of one of the first three costal shields. The small extent 

 of the transverse diameter is well shown. 



Egerton Collection. 



39198. Fragment of rock showing the impression of the outer sur- 

 face of a fourth costal shield. 



Bowerbank Collection. Purchased, 1865. 



39198 a. Fragment of rock with the impression of the outer surface 

 of a small shield. BoiuerbanJc Collection. 



37979. Fragment of rock showing one side of an imperfect coracoid 

 (Fig.) not improbably belonging to this form. Figured by Mackie 

 in the ' Geologist ' for 1863, p. 41, as Chelys (?) UaTcei, of 

 which it is the type. In its expanded distal extremity 

 this specimen resembles the coracoids of Chelys and Pleuro- 

 sternum, but there is a longer interval between the 

 glenoidal extremity and the distal expansion. 



Purchased, 1863. 



