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 | 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 I 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, 13|. 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 oh 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 grqye, 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 



