374 mr. k. ay. hooley 03 the [June 1 9 13, 



Scapula : The left, minus a moiety of the humeral end. 



Humerus : The proximal and distal ends of the right, and the distal of the 

 left. As the proximal extremity of the former was lying with its ventral 

 surface exposed, the ulnar and radial processes have been worn to their bases. 

 The concavity between them is filled in by matrix, and overlain by the thin 

 plate of the ventral posterior half of the right ischium. Tha latter bone was 

 once overlying this end of the humerus, but pressure has squeezed that portion 

 above the remainder of the ischium, so that the humerus appears to be resting 

 on that bone. The removal of this fragment has been found impossible. 



Radius and ulna: The whole of the right radius and ulna, excepting 

 89 mm. (the missing section) from their shafts, and slightly more than the 

 proximal halves of the left. 



Pteroid : The perfect right pteroid. 



Carpal s : All of both wrists, except the left lateral carpal. 



Metacarpals : The proximal end of the right-wing metacarpal, and one of 

 the small right metacarpals. 



Phalanges: The distal extremity of the first, the major portion of the- 

 second, and the proximal end of the third phalange of the right wing. 



Ischium : The almost perfect right ischium. 



Particulars of the Atherfielcl Specimen, No. 2. 



The bones of this specimen are in one block, also obtained from 

 the sea, which has likewise worn away the ends of many of them. 

 That it does not belong to the blocks in specimen 'No. 1 is proved 

 by its containing similar bones. They lie on a layer of hard blue 

 limestone, but are embedded in the same matrix of silt. 



The following bones are preserved : — 



Scapula : The humeral end of the right scapula. 



Oorac o id : The perfect right coracoid. 



Humerus: The distal halves of both humeri. The dorsal surface of the 

 left and the ventral of the right are exposed. 



Radius and ulna : The proximal ends of the left radius and ulna. 



Metacarpals : The distal extremity of the l-ight and the distal third of the 

 left wing-metacarpals. 



Phalanges : The proximal half of the right and left first wing-phalanges. 



II. Description of the Skeleton 



The skull is nearest in outline to Pterodactylus ; but the occiput 

 is square, and not rounded as in the figures and restorations of that 

 genus. The extremity of the snout and the brain-case are the only 

 portions of the skull that are completely enveloped in bone. 

 These two regions are connected dorsally by a triangular bar, and 

 ventrally by thin band-like niaxillas. The tip of the muzzle is 

 truncated. Here both upper and lower jaws are moderately convex 

 from side to side, and gently curved longitudinally. There is neither 

 nerve-pore nor foramen visible on the upper and lower jaws. 



The upper jaw, 33 mm. from the tip of the muzzle, or above 

 the seventh tooth, becomes laterally compressed — a compression 

 which gradually intensifies, until at the commencement of the 

 nares, the sides are decidedly concave. The dorsal outline of the 

 beak makes a very acute angle with the lower jaw, which is 



