18.4 



UALJiNOPTERID^. 



slightly produced capitular processes. The Becond rib is 45" in 

 length, the third 60", the fourth 01", the fifth 62^", the sixth 

 01^", the seventh 61^", the ninth 57", the twelfth 51", the thirteenth 

 49", and the fourteenth 48". They gradually decrease in breadth 

 from the first. The last is considerably twisted on itself ; it has a 

 small, flat articular head, but there is no corresponding surface on 

 the foiu'teenth dorsal vertebra, which is only slightly thicker at the • 

 extremity than the succeeding ones. On the thirteenth vertebra 

 there is a distinct articular surface. 



" The sternum (fig. 12, h, p. 110) is small, in the form of an irre- 

 gular transversely elongated lozenge, the posterior angle being nar- 

 rower and more produced, and the anterior more rounded, than in 

 the Zuyder Zee specimen ; so that it approaches more the form seen 

 in the genus Plujsahis. Its length is 8^", and its breadth 12-|". 



" The scapula is low and broad, with a long acromion and weU- 

 developed eoracoid process. Its breadth is 40", its height 22f" ; 

 the acromion 10" long, and 3" in depth ; the eoracoid 4" ; the gle- 

 noid fossa 8^" by 5^". The humerus is 15" long, by 6" in diameter 

 in the middle of its shaft and 7^" at the lower end. The radius is 

 24:^" long in a straight line, 4"-G broad above, 3"-7 at the middle, 

 and 5"-3 at the lower end. The ulna, which is 25" long, including 

 the olecranon projection, is 7"'5 broad above, 2"-7 at the middle, and 

 4"-5 at the lower end. The thickness of the radius at the middle is 

 2"-2; that of the ulna l"-8. 



Fijr. 47. 



Fio-. 48, 



Fig. 47. Tympanic bone ; half nat. size. 

 Fig. 48. One of the sitylo-liyals. 



" The hyoid bone, formed of the completely united basi- and thyro- 

 hyals, is flatter and deeper from before backwards, and the latcial 



