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LESLIE B. AEEY AND W. J. CROZIER 



ous apparatus being relatively unconcentrated and containing 

 ganglion cells along the length of both pedal and pallial nerve 

 strands. The large size of C. tuberculatus and the fact that it 



Fig. 10 Outline of a medium-sized Chiton tuberculatus, dorsal aspect, 

 detail drawing of a part of the girdle is magnified diameters. X 1. 

 Fig. 11 The same, ventral aspect. X 1. 



The 



will remain in an active condition out of water for a long time 

 make it possible to study the local reactions in this species with 

 considerable detail. 



