56 SPECIMENS OF CETACEA. 



[Nos. 50 to 54 are from the Turner Collection.] 



50. Rete mirabile. A portion of the rete from the Longniddry 



fcetus. The arteries have been dishevelled to show 

 the convoluted and plexiform arrangement. 



51. Vein, portal, of Longniddry fcetus ; the lumen is 2h inches 



in diameter ; two subordinate veins are continuous 

 with it. 



52. Skin. Portion of cuticle peeled oft' the lip of the Long- 



niddry sihhaldi which displays its black colour. 



53. Skin. Portion of skin of the ventral aspect of the Long- 



niddry f<etus, showing the characteristic ridge and 

 furrowed plications in the Rorquals. 



54. Skin. Vertical section through one of the folds of skin 



of the venter, showing cuticle and cutis. 



55. Eyeball, left, entire, of the Great Rorqual, B. sihhaldi, 



showing the dissected sclerotic, the attachment of the 

 recti muscles, one lialf of the cornea, and a portion of 

 the ocular conjunctiva ; transverse diameter 5^ inches, 

 antero-posterior 3^ inches. Optic nerve from brain 

 to eyeball said to be 5 feet long ; the nerve is 

 surrounded by a vascular rete mirabile. 



Knox Collection, No. 24. 



[Nos. 56 to 61 are from the Turner series of Placentae.] 



56. Placenta. A portion of the chorion of the Longniddry 



sihhaldi, showing the villous surface and one of the 

 great longitudinal ridges, not injected. See Trans. 

 Roy. Soc. Edin., 1870. 



57. Placenta. A portion of the same chorion, showing a 



flattened triangular fold, not injected. 



58. Placenta. A portion of the same chorion, showing villous 



surface, portions of two longitudinal ridges, and a 

 non-villous area which was j)i"obably in relation with 

 the OS uteri internum. 



59. Mamma. Transverse section through the chief duct of 



the gravid Longniddry sihhaldi ; the coat averages 

 1 inch in thickness, and the lumen is about 4 inches 

 in diameter. See Trans. Roy. Soc. Edin., 1870. 



60. Mamma. One of the large ducts from the same, opened 



to show the longitudinal folds of the mucous 

 membrane and the openings of some of the smaller 

 ducts. 



