RHINOCHELYS. 181 



was obtained from the Cambridge Greensand, and is pre- 

 served in the collection of T. Jesson, Esq., of North- 

 ampton. The extremity of the beak is well preserved, 

 and the contour of the nasals, prefrontals, and frontals is 

 shown. The palate is obscured by matrix. 



Made in the Museum, 1889. 



Specifically Undetermined Mandibles, of which at least the majority 

 are referable to this 



49919. Fragment of chalk exhibiting the ventral surface of the 



symphysis and part of the right ramus of a comparatively 

 large mandible ; from the Lower Chalk near Lewes, 

 Sussex. Capron Collection. Purchased, 1879. 



49920. Fragment of chalk showing a somewhat smaller imperfect 



mandibular symphysis ; from near Lewes. The extre- 

 mity of the median oral ridge is shown. 



C apron Collection. 



47221. Two specimens of mandibular symphyses, with the oral 

 surface embedded in matrix; from the Chalk Marl of 

 Dover, Kent. Gardner Collection. Purchased, 1876. 



R. 793. The anterior extremity of a mandible ; from the Lower 

 Chalk of Dover. Purchased, 1886. 



R. 401. Fragment of rock, exhibiting the anterior extremity of a 

 large mandible, probably belonging to this genus; from 

 the Lower Chalk near Weymouth, Dorsetshire. This 

 specimen would agree in relative size with the cranium 

 No. E. 1496 of B. elegans. 



Presented by C. Westendarp, Esq., 1884. 



R. 402. Fragment of rock containing the proximal extremity of a 

 right humerus, apparently associated with the preceding- 

 specimen ; from the same locality. The humerus accords 

 generally with that of Chelys, both in size and contour, 

 and also closely resembles the somewhat smaller humerus 

 of Parachelys (infra, p. 195). 



Presented by C. Westendarp, Esq., 1884. 



35185. The imperfect symphysis of a comparatively large mandible, 

 with the oral surface obscured by phosphate ; from the 

 Cambridge Greensand. Purchased, 1859. 



35191. The symphysis and part of the left ramus of a mandible 



