42 



W. LlLLJEBORG, 



is abruptly truncated and high. The inner side of the hone is sharp in the 

 upper part. Its lower end is thick, but not so thick as that of the next 

 rib, and its section at that part nearly elliptical. Its length measured along 

 the external edge of the curvature 3' 1"; its breadth at the lower end 3|"; 

 and its thickness in that part If". 



The next following or 4 th n'6 (fig. 108) is somewhat larger and 

 longer, and also thicker at the lower end, where it has tolerably visible 

 longitudinal furrows. Its section there is almost oval. The upper end, 

 which is strongly compressed and thin, is pointed, and exhibits some appea- 

 rance of a capitular process. Its length measured along the outer curva- 

 ture is 3' 9-f-"; breadth at lower end 3|"; thickness at that part 1-f-". 



The next following or 5 th rib (fig. 109 — 111) is like the preceeding, 

 but rather longer, and at the lower end narrower and thicker, and 

 ovally rounded in the section (fig. 110). At the upper end this rib also 

 is compressed, but somewhat more strongly curved than the foregoing 

 and with an almost similarly insignificant capitular process. Like the fore- 

 going its lower end has evident signs of longitudinal furrows. In all three 

 ribs this end is very spongy at its extremity, and seems there to have been 

 provided with a still cartilaginous termination. Dimensions: Length along 

 the outer curvature 4' 2"; breadth at lower end 3"; thickness at d:o 2". 



The two pieces of ribs , each consisting of two fragments , belong to 

 the left side, and the ribs, of which they have formed a part, have been 

 narrower and longer than those above described. The longest, which is 

 also narrowest, is almost round at both ends, and it, as well as the other 

 fragment, belongs to the middle part of the rib, both the upper and lower 

 ends being lost. The narrower, measured along the external curvature, is 

 2' 7", the other piece 2' 6j", the first at the lower end If", the last 2j" 

 broad. The situation of the latter has without doubt been more forward. 



The blade-bone (scapula) (PI. XI. figg. 112, 113, the left) is also of 

 the highest importance in classifying this Whale. All the cartilaginous por- 

 tions that were atached to this bone are lost. The acromion is tolerably 

 long, but its thick, abruptly truncated and spongy extremity shows that it 

 had a cartilaginous continuation, and accordingly is not fully developed. 

 The processus coracoideus is absent, but the caput scapulae shows at the 

 anterior angle (a) an ascending rough surface, which has no doubt served 

 for the fixing of this process as yet in a cartilaginous state, for it, as is 

 well known, is much later developed than the acromion. On this ground 

 we assume that this species is provided with a processus coracoideus. Both 

 the form and position of the acromion in this Whale differ from those which , 



