S 9 



passing int 

 longitudina 



. 5 



O <s 



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muscle 

 entral 



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- ^ " CD " 



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.- 



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 ^ id +3 



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S > B S 



+= "3 -S 



OJ T3 



2 T3 3 S 



5 ~ h s-' 



- S feT , 



1^ * 

 | |?.| 



in 60 O "o 



g .5 2 ? 



nephridia 

 of proto 



cr & 



o 



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 *-t ^3 



a 



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 en 



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S; fe; 



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s ^ 



5 _ g 



g & 2 .3 



lo^S 



S|f 



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 'S -e -g 

 w i o-2 



oi O & 

 ' ' &. 



S ^ ^ = 



T3 ic o O 



S M 



a. CD CM" . 



S = "= "3 

 zz -^> v> f-^t 



o 



15 



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'5 73 



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11 



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146 



