30 



LEECHES 



Proboscis 

 \ ^^--Oesophageal gland 



]„-- Male pore 



Female pore 



-Vas deferens 



yvTT 



Sffll 



Folded orgon 



Rectum 



5mm 



Fig. 18. Branchellion torpedinis: (a) dorsal view with gills 

 removed and segments labelled on left hand side ; (b) diagram 

 of gut and reproductive system ; (c) detail of the posterior crop 

 diverticula showing fusion in five places. After Sukatschoff, 1912. 



typical leech pattern. The clitellar glands are particularly developed 

 in the Piscicolidae and in Branchellion take up all the space 

 between the gut and the body wall in segments X-XII. 



