Fig, 27. 



BALJ5N0PTERA. 561 



head and tubercle of tlie rib. It is single-headed, and the head and tubercle are well- 

 developed, the distance from the outer margin of the latter to the inner border of the 

 head being 6-25 inches. The breadth of this rib across the angle is 4-25 inches. 

 The sixth rib is slender, but it has a well-defined angle, at which it attains a breadth 

 of 2-60 inches. The length from the inner surface of the head to the free end is 

 51-50 inches, and it has a width at the lower end of 2-20 inches. 



A humerus, radius, and ulna were saved. The first has much the same 



character as the same bone in B. schlegeli, but its 

 lower end is more dilated. It measures in extreme 

 length 12-25 inches, and at its middle is 4-60 broad, and 

 at its inferior end 6-75 in breadth. The radius, at its 

 upper end, is 4-90 inches broad by 2-60intHckness,and, 

 at its middle, 3-50 in breadth and 1-45 in thickness. It 

 has a length of 21-75 inches, but a small portion of its 

 lower end has been broken off, but not more, I should 

 think, than half an inch. The ulna has the general 

 characters presented by this bone in Balcenoxdera, but, 

 like the radius, a small portion of its distal end has been 

 lost. Between the articular ends it measures 19-25 inches, 

 and at its middle it has a breadth of 2 inches and a thick- 

 ness of 1-50. 



The aspect of the humerus, re- 

 duced to ^th of its natural dimensions. 



A metacarpal was also rescued, and it would indicate that the fingers had had 

 the short characters of the manus of B. musculus. 



Fig. 28. 



Hyoid bone of tlie Sittang Whale, reduced -jth its natural dimension. 



The hyoid bone (fig. 28), having the usual constitution, has the lateral process 

 long and narrow, and more resembling the processes of B. sihbaldi than those of 

 the hyoid of B. schlegeli. The extreme breadth of the hyoid is 25 inches, with an 

 antero-posterior length of 9-75 inches. The stylohyals are also larger and less 

 expanded than in B. schlegeli : one measures 4-75 inches in extreme length, with 

 a maximum breadth of 5-25. 



t3 



