SEA-FISHERIES LABORATORY. 



433 



Fig. 12. — Diagrammatic transverse sections through the left half of 

 the body to show the excretory system. 



A. = at the level of the external excretory aperture. 



B. = at the level of the "green gland." (The gland is shown as a 



dotted line.) 



C. = at the level of the oesophagus. (For 8.H. read Hep.) 

 Card. = cardiac region of the fore-gut. o.l. = oesophageal lobe. 



o. = oesophagus. md. = mandible. 



a.l.o. = outer portion of antero -lateral lobe. 



(Other references as in Fig. 11). 



