H2H 



l)|{. K. 10. IlKDDAIM) ON A 



Ket'iu lo biilon^r t,() ilio saiiio sysicin. 'riioso conisist- of livrgor but 

 vory sliori stoiHS willi (iiuvr l)rivii('li(\s. .1 havn not tnict'd iUiy con- 

 noctioii hotwooii tho80 tubey nnd tlui iiiiuii st(ans of the oxciotoiy 

 syHtom ; but I can, nevertluildss, liar<lly (l()ii))i> tluit it exists. 





« 



f^x 





A nioro liiglily iiiii};iii(i(Hl sct^liou Ihi'ou^i'li cxcrclDry vessels and adjucont 

 striu'luri's of t.lio asoxual roviii of l^rnci/stidiitm (femiiiij>anu)i. 



d.r. Dorsal vi^ssols siuTouiulod by circular nmsclo-lihrc'. m. Layer of (rausvcM'sc 

 iiiuscle-libres separating' llie cortex (to the right) i'roni the niodulla (to the 

 lel't). II. One oi' several tubes forming tbe excretory network and lying, as is 

 shown, in the cortex as well as in the medulla, f.r. Transverse commissural 

 vessel forking to join the ventral vessel (I'.v.), which is also bifurcate to recsive 

 the branuhuM. 



TIuIkSP rainiflcations lio in tlui cortical layer as well as in tlie 

 inodullary (t(>xt-lig. IIT), ii). In o\w case 1 observed a narrow 

 duct loading from a \vid(>r spacti to the exterior — at any i-ate, most 



