Prof. BucKLAND on the Pterodactj/lus Macronyx. 221 



process with the head of the articulating rib in contact with it. C is the body 

 of a vertebra showing a convex articulating surface^, as in the crocodile^ with 

 a cast of the medullary cavity at 2 ; the annular portion is lost. Traces of the 

 spinous processes of another vertebra are seen at C 1. 



d. Vertebra, probably lumbar, showing its concave articulating surface, one 

 transverse process, and two anterior spinous processes. Behind this we see the 

 body and large transverse process of another vertebra, probably sacral. 



e. Ribs dislocated; impressions of other ribs appear on the stone. 



K. Tail. — Three caudal vertebrae, much larger in proportion than those of 

 P. longirostris ; the legs also are larger and longer : and the tail was probably 

 longer^ and may have cooperated with the legs in expanding the membrane for 

 flight: — a long and powerful tail is in strict uniformity with the character of a 

 lizard. 



9. 9. Omoplates; — long and narrow as in crocodiles, but still more nearly 

 resembling those of birds. 



X.X. Coracoid bones; — large as in birds for support to the wings in flight. 



Clavicle ; — none apparent. 



18. Sternum — is much broken, and its form indistinct, but was large and 

 broad for the attachment of pectoral muscles. 



1. 1. Humeri; — lower extremities. 



l". 1". Humeri ; — upper extremities having the anterior tuberosity salient 

 as in birds, but partly broken off"; the right humerus and right scapula are 

 much displaced ; the left humerus and other bones of the left wing are nearly 

 in their natural juxta-position, 1. 2. 3. 4. 5. 



2. 2. Fore-arms; — showing no traces of any ulna. The right fore-arm is 

 imperfect. 



Carpus. — In the left carpus four bones are distinctly visible,/, g-. h. i. Three 

 of these are in contact with the radius, and the fourth (i) is in contact with 

 the largest metacarpal bone : the bones of the right carpus are all dislocated 

 and dispersed,/ k. I. m. 



3. First, second, and third metacarpal bones of the right hand ; — the under 

 surface placed upwards. 



3'. First, second, and third metacarpal bones of the left hand. 



3". Metacarpal bone supporting the fourth or wing-finger of left hand. 



3'". Metacarpal bone supporting the fourth finger of right hand. 



S. Three fingers of the left hand terminating in long claws ; — there are two 

 phalanges in the first finger^ three in the second, and four in the third finger, 

 as in crocodiles and lizards. 



S'. The right hand ; — all the bones of the first and third fingers are present, 



