184 



BALENOPTEEID^. 



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

 length, the tliird 60", the fourth Gl", the fifth G2i", the sixth 

 61^", 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'tecnth dorsal vertebra, which is only shghtly thicker at the 

 extremity than the succeeding ones. On the thirteenth vertebra 

 there is a distinct articular surface. 



" The sternum (fig. 12, b, 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 Phi/salus. Its length is 8f, and its breadth 12-|". 



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

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

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

 noid fossa 8 V 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 

 24J" long in a straight line, 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 ajid deeper from before backwards, and the lateral 



