BIOLOGICAL BULLETIN, VOL. XXXI. 



PLATE VII. 



175 



.; '..' ' " 



A 



176 



177 



170 



180 



181 





184 185 



186 



*V* "'. 



f^"%: 

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- :* 



; T1S 



A 



187 







188 



wr 



ISS 



202 





^ 



203 



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 +m^' 



204 



MICHAEL F. GUYER. 



