SENSE ORGANS. 



43. Statocyst : the statocyst of a shrimp seen under the microscope shows the 

 central concretion resting on hairs which are in contact with the sensory nerve-endings. 



44. Semi-circular canals : demonstration of the action and structure of the semi- 

 circular canals. 



(a) Model of a semi-circular canal ; 



(b) Dissection of the semi-circular canals of a fish and of the branches of the 8th 

 cranial nerve coming from the ampullae. 



