28. 



arrangement of the oapill*jri** into threes were Vnown t-ruout 



the re^t of the body <-ii9 would certainly say that each j ined 



accessory 

 the/collecting tubule or the collecting tubule singly instead 



of in threes. However, Vnowing thin grouping intc threes at 

 the posterior end, it is not difficult to make the proper 

 association here. This widening of the distance between 

 the itt \ohment of the capillaries in a &rcup i accounted for 

 by 1 r^dual less nf the iccesaory cell acting tubules or 



by th merging of the accessor; collecting tubule and the 

 collecting tub-ule into one. 



These groups of three flarae cells are arranged doraally 

 and venttally in a definite, yray. The s*>8t anterior group 

 is e3 spatially a dnrsal group appearing quite olo*e to the 

 >r surface. The n&x% gr^up of threes is a ventral one, 

 the next one is dorsal, the next ventral **nd so on to the 

 posterior end. The dor sal -ventral arrangem<int of the last 

 two groups, however, 1 cannot be sure rf because r.f their 

 much noil ing, y^t I soa reawnibly certain that the>> are so 

 arran l? *d. thit rranf$ement is jjrobable if the entiie body 

 i^ tr be drained equally. Again within the group of threes 

 there is a definite arrangement. Starting at the anterior 

 end the first flane oell ia dorsal, the next ventral, the next 

 dorpal; then in ttee neirt group of threes the fir*t in ventral, 

 the nert dorsal, the next ventral, md BG rn. This Again is 

 logical arrangement if dorally and. ventrally the body is to 

 be equally ^ell drained of wastes. *0ie*e twc plans, or some 

 modification, I should expect to find in all oercarifie?*nd adul 

 but *3 yet I believe it haa never been reported. 



From a study of the literature *nd the drawingo of the 

 excretory systems of ceroari^te th:?t have been worVed out, and 



