36 OENITHOSATJKIA. 



28610 a. An undetermined imperfect bone. Purchased. 



40126 n. An undetermined imperfect bone. Purchased. 



* Numerous other imperfect bones in the Collection are not 

 catalogued. 



The following specimens may indicate young individuals: — 



40126 p. Four terminal phalangeals of the ulnar digit of the manus. 

 Length of smallest 0,023. Purchased. 



28610 b. An homologous bone. Purchased. 



28610 c. A humerus. Length 0,019. Purchased. 



Rhamphocephalus depressirostris (Huxley x ). 



Syn. Phamphorhynchus depressirostris, Huxley 2 . 

 (?) Pterodactyhis aclandi, Owen 3 . 



Characterized by the presence of only five lower teeth, and by the 

 slight concavity of the inferior border of the mandibular ramus. 

 The following specimen indicates a large form agreeing in characters 

 with this species, and from its size is probably the same as Owen's 

 P. aclandi ; if these specimens should be specifically distinct from 

 this species, the latter name might be retained. 



Hob. Europe (England). 



47991. Part of the right ramus of a mandible, provisionally referred 

 to this species, and showing the four posterior teeth and 

 the alveolus of the first tooth ; from the Lower Jurassic of 

 Stonesfield, Oxford. This specimen is larger than the type 

 mandible of the present species, but is otherwise similar. 

 Presented by the Hon. B. Marsham, 1877. 



The following specimens from the same locality agree in relative size 

 with the preceding mandible. 



40126 j. The ulna. Length (excluding olecranon) 0,157. The 

 distal extremity agrees very closely with that of the cor- 

 responding bone (No. 35324) of Ornithochirus from the 

 Cambridge Greensand. Purchased, 1866. 



40126 c. The first phalangeal of the ulnar digit of the manus. 

 (Fig.) Figured by Owen in his ' Mesozoic Eeptilia' (Mon. Pa]. 



1 Quart. Journ. Geol. Soc. vol. xv. p. 663 (1859). — Bhampkorhynchus. 



Loc. cit. 

 3 Mesozoic Eeptilia (Mon. Pal. Soc:), pt. i. p. 11 (1874). 



