12 PROFESSOR STRUTHERS. 



between the finger and thumb. It had been noticed before that 

 some of them projected f to 1 inch, but whether this was natural 

 or owing to the hair coming out I cannot say. If the piece of 

 black epidermic sheath adhering is to be taken as marking 

 where the follicle began, one of the eight I have preserved must 

 have projected for J inch. Our inability to find hairs on the 

 upper jaw was not surprising, as the brushing and usage this 

 part had received had already removed the epidermis. Those I 

 took out grew from the tubercles at the symphysis, but one was 

 found two feet back from the symphysis, on the second lateral 

 tubercle, projecting about J inch. It is an interesting question 

 in what relation the tubercles and the hairs stand to each 

 other. 



12. ADAPTATIONS OF THE JAWS. The projection of the lip of 

 the mandible beyond the upper jaw is, at the front 13 inches ; 

 at the side, before the labial groove begins, 13J. The thickness 

 of the soft tissue (lip or gum) forming the upper edge of the 

 mandible was, at 1 foot from the symphysis, 2 inches ; at the 

 side, where the labial groove begins, about 6 inches. 



Labial Groove (see fig. 5). At 3J feet from the symphysis, 

 being about one-third of the distance along the side of the mouth, 

 the lip bifurcates to form a deep broad groove, the inner boundary 

 of which is the continuation back of the jaw, the outer border 

 cutaneous. This groove deepens and broadens backwards to 

 a breadth of 15 inches as a deep grove, and, becoming gradually 

 shallower and broader (reaching a breadth of 30 inches), it 

 is lost on the surface on a line drawn from the angle of the 

 mouth downwards and forwards. The furrow seen below the 

 shoulder in fig. 5, as if continued from it, is not a continuation 

 of it. The whalebone range descends within the mandible, and 

 the water escaping from between the plates will be conducted 

 backwards along this labial groove. I am not able to say 

 whether this great spill-water groove is in any way peculiar 

 to Megaptera. 



13. CUT- WATER. At the point of the mandible, which is blunt 

 (transversely 8 inches, vertically 7 inches), a median ridge 

 goes down to a median projection, placed like a prow or cut- 

 water. The height of this cut-water is 14 inches ; breadth, 

 2 inches; amount of projection, 4 inches, the lower third 



