PLATE XVII. 



Fig. 84. Longitudinal section through the anal region. Showing the ganglion and its relation to the lateral nerve 



cord. I Ob. X 4 Oc. Camera. X 450. 

 Fig. 8o. Transverse section through the region of the anal papilla. Showing the relation of the nerve ring to the 



lateral nerve. }. -Ob. X 4 Oc. Camera. -'450. 



lis 



o 



