PETLL00ABIDAN8. 



9B 



Fia. 116.— Partly diagrammatic section through the thorax of ITebalia. en, thi 

 axial-jointed endopodite; ex, exital portion or gill {above irregularly dotted 

 and flabellum below with transverse rows of dots; c, carapace; ht, heart; 

 inty intestine; ng, nervous system. 



Fig, 117,~Zoea of the common Crab (Cancer irroratus). Much enlarged 



