184 



BALiEIfOPTEKID^. 



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

 length, the third 60", the fourth 61", the fifth 62^", the sixth 

 61|", the seventh 61^", the ninth 57", the tweKth 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 articidar head, but there is no corresponding surface on 

 the fourteenth 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, 6, 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 Physalus. Its length is 8f ", and its breadth 12|-". 



" The scapida is low and broad, with a long acromion and well- 

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

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

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

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

 24i" long in a straight Une, 4"-6 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. 



Fig. 47. 



Fig. 48. 



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

 Fig. 48. One of the stylo-hyals. 



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

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



