MONODON. 101 



21. Brain, without the membranes, divided into three 



portions, removed from skull b}' Dr Robert Gray. 

 Weight 3 lb. 12 oz. 



Donor— Sir John Batty Tuke, M.P. 



22. Placenta. A portion of the wall of the pregnant uterus 



of the Narwhal, showing the crypts in which the 

 villi of the chorion, injected red, are lodged. This and 

 the other preparations of the placenta are from the 

 specimen described by Sir Wm. Turner in Proc. Roy. 

 ySoc. Edin., vol. ix., 1876. 



23. Placenta. A portion of the pregnant uterus of the 



Narwhal, showing the relationship of the villous 

 surface of the chorion, injected blue, to the uterine 

 mucosa (red) ; a j^art of the chorion has been reflected 

 from the mucous membrane. 



24. Placenta. Pole of the chorion of the fecundated cornu, 



showing the diffuse arrangement of the villi, the 

 vessels of which are not injected. 



25. Placenta. Pole of the chorion of the Narwhal, from the 



cornu opposite to that occupied by the f tietus ; villi 

 minutely injected red. 



26. Placenta. A portion of the chorion of the same animal, 



showing the non-villous area opposite the os uteri 

 internum surrounded by villi injected red. 



27. Placenta. A portion of the umbilical cord of the Narwhal, 



showing the amniotic corpuscles. 



28. Placenta. A portion of the cervical end of the pregnant 



uterus, the os uteri externum and the v^agina of the 

 Narwhal, showing the folds of the mucous membrane. 

 Not injected. 



29. Stomach, figure of foetal, from a specimen 5 feet 1 inch 



long. The (i-sophagus, Oe, communicated with the 

 paunch, 1, which opened close to the cesophagus into a 

 large compartment 2, succeeding which was a small 

 compartment 3, then a larger 4, that opened into the 

 pyloric compartment 5, from which the duodenum D 

 proceeded. See Turner's description in Journ. Anat. 

 and Phys., vol. xxiii., 1889. Figure on page 102. 



