1907.] from zanzibar and east africa. 461 



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EXPLANATION OF PLATE XX. 



Figs. 1-3. POITPUS HOESTI. 



Showing three stages in the regeneration of the arms, natural size, p. 452. 

 r, rudiment of new arm. 



Figs. 4-11. OCTOPOD EMBEYO. 



Showing stages in the development of the tufts of cuticular bristles, 

 X 600, p. 459. 



Fig. 12. Polypus hoksti. 

 Portion of an arm showing the zebra-like markings, natural size, p. 452. 



