40. 



the suTie as 



is/the condition found in the adult. 



Ixxoss, in 1892, thirteen ye--trs after the 

 tff the first fl^iae cell in a di^enetio tresaatode* wcriked 

 out quite completely the excretory system of 



In the oeroaria he found the excretory 



system, *8 well as other parts, to be bilaterally oymetrieal 

 an^ the capillaries and fl:ii? cells to 'nave a definite 

 pattern, Ior3s (1894) also found that the excretory system 

 r f the adult worm, Allo o read ium i sc po rum (loose} was 

 on a definite "2 x 6 x 4" plan, th- t 0.pAgthoplyfthe ran^g 

 (Proel.) was built on the W 2 x 6 x 3" plan; that liaplcmetr^a 

 qryllnqraoea (eder) iraa also built on the "2 x 6 x 3** plan* 

 Several others included in this paper showed a definite 

 grouping of fl-uae oella on each ?3ide as far as hfc oould 

 tr-tce tiiem. '3ometim the anterior end and again the 

 po^t^rior end would ba too opaque to trace tne fine oap- 

 illaries. Again he found (loose 1896) in Anchitreiaa 



um^ ( Sons) a definite arrruigemont altho some of the 



capillary grcupB are in t*D f e whil ott-iers are in three's. 

 However, in *ach oaae bo Ui sidee of the body are the some. 

 Cort (1918a, fig. 2) shows A^ aaio d i $ to rauta tort r ei ana e (la Hue) 

 to be built on the *2 x 10 x 6* plan. Cert (1918o, pi. VII) 

 chows Ceroari3e,ura mutabile to have a definite "2x8x4" 

 plan. He (1919a) ml?5o allows Per car la polyadena to have a 

 definite forarula, it b-ing "2 x 6 x 3". Itollfus (1911. fig. 

 1 and 2) shows the excretory system of GymnpyhalluB apiaateria** 

 l*vinen to be built on the "2 x 4 x 2" plan, and th-it of 

 Ceroafia peotinata HuAt on the "2 x 7 x 2 w plan. ^he Oeroaria 

 JB.ehino.8to.ma revo 1 utura is built on Uie 11 ^ x 8 x 3* plan. 



