LÖNNBERG, THE PELVIC BONES OF SOME CETACEA. 15 



flattened and thinner than the middle of fche bone and its 

 posterior end, ischium. The maximum width of ilium is 31 

 mm., and generally it is between 2 ^j-i and 3 cm. Not count- 

 ing a subterminal boss of the ilium which there increases 

 the thickness of the bone locally to about 14 mm., otherwise 

 it varies between 9 and 6 mm. Towards the middle of the 

 bone it becomes gradualjy more and more thickened to 15 



Fig. 12. Sketch indicating the situation of the pelvic rudiment 

 and the pen is of Globicephalus melas. 



mm. in the right and 18 mm. in the left bone. The same 

 thickness is retained on the ischium which thus is more 

 rounded and terminally has a cartilaginous epiphysis. 



Fig. 12 is a sketch which indicates how crura penis are 

 attached to the pelvic rudiment on its lower side. The attach- 

 ment is effected by means of a capsule with a network of 

 connective tissue. 



Tryckt den 16 december 1910. 

 Uppsala 1910. Almqvist & Wiksells Boktryckeri-A.-B. 



