BAL^NA. 27 



85. Rete mirabile lining the inner surface of the dura mater 



of a Whale ; the vessels are injected with wax. The 

 specimen may possibly have been from a B. mysticetus 

 in the Knox Museum. 



86. Skin. Section of skin of adult B. mysticetus. The 



cuticle, 1 inch thick, has been partially reflected 

 from the cutis, and the lono; papillae of the latter 

 have been drawn out of the deep part of the cuticle, 

 the striated appearance of which shows where the 

 papillas had been lodged and the extent of their 

 penetration into the cuticle. 



Knox Collection, No. 73. 



37. Skin. Thick cuticle of the Greenland Whale. The attached 



surface, mottled with black pigment, shows the minute 

 holes and grooves for the passage of the papillae of 

 the cutis ; the sides of the section through the cuticle 

 show the striated appearance produced by the spaces 

 in which the papillae are lodged. 



Knox Collection, No. 74. 



38. Hair. Lip of a fretal Mysticete ; two delicate hairs 



project from it and form a rudimentary moustache ; 

 a groove for other hairs is present. See figure below. 



39. Brain of B. inysticetus, without membranes, removed 



from the skull by Dr Robert Gray. Weight 4 lb. 

 8 oz. Donor— Sir John Batty Tuke, M.P. 



40. Eyeball, antero-posterior section of adult B. mysticetus 



45 feet long:, showing' the external coats and the 

 vascular rete surrounding the optic nerve. The 

 diameter of the eyeball is 3 inches transversely, 

 1| inch antero-posteriorly. Knox Collection, No. 78. 



41. Eyeball, transverse section of Mysticete, showing on 



one aspect the optic nerve, with the vascular rete 

 mirabile which surrounds it before it pierces the 

 sclerotic ; on the other aspect the nerve is seen after 



