— 108 — 



In conclusion I subjoin a few measurements relating to the skull, so far 

 as these have not been recorded in the preceding discussion. 



(the measurements are taken in projection): 



length of skull 612 c.M. 



breadth of skull (squamosum behind zygomatic arch) 296 



breadth (quite at the back) 255 



height of skull 108 



protrusion of lower before upper jaw 52 



total length of the head (612 + 52 c.M.) 664 



breadth of upper-jaw in the middle 189 



length of intermaxillaries, (measured along the bone) 498 



diameter of eye-socket (length- 35 



occipital condyles (aggregate width) 44 



height of inferior maxillary in the middle 45 



breadth of blowhole 44 



The nasalia (fig. 5) correspond with those of Balaenoptera musculus L. 

 in so far that they are remarkably broad. In most other respects their shape 

 differs entirely from the drawing given by Reinhardt (5) p. 186 and by 

 True (6) plate 7 fig. 10. 



These nasal bones are extraordinarily light and porous; the two front 

 surfaces combined in vertical projection yield a figure that can be most closely 

 comprised within an isosceles trapezoid, 44 c.M. high and whose upper parallel 

 and basis are 20 and 331/2 c.M. resp.. 



The front and lower surfaces of the nasalia are smooth and slightly 

 concave; they contribute to the formation of the wall of the blow-hole which 

 in our skeleton is broader behind than in the illustration by Reinhardt to 

 which reference has been made before. 



The front of the nasalia combined possesses at the upper half a prominent 

 median part, which projects most before the plane of the bone just above the 

 centre of the anterior surface in question. 



The combined under-surface, narrowing towards the back, shows a de- 

 pression in the median part just before the middle and behind it a prominent 

 bony ridge or keel extending to the posterior end of the nasalia and most 

 prominent there. The more or less rough lateral surfaces are articulated with 

 the posterior and interior parts of the intermaxillaria. At the front side may be 



