36. 



he states this frr geroatia MfljMjK** (1917, p. 79). "The 

 excretory tube in the tail is a single median tube for 



about V% -fifths of the way distad, at which point it 



T pB 



forVs --md continues double the remainder of the way 

 dis tad, with numerous cross anastomoses* It does not 

 open to the outside on either side or end*. The excretory 



*V.t '" VO 



eye t era in the tail of Geroaria. a can trO a to ma itoust finds 



to be still different as is shown by the following quotation. 



n 



The excr<3to-ry system in the tail is confined to a long 







sao-li^e reservoir, extending the entire length of the 

 orgun without any definite *vall or lining* Near the 



proximal end it frequently bulges out on each side to f c ra 



'- ' 't.^fi fwi.j )-i. i iiirerttly 



a later*! reservoir*. He shows this aac-liXe reservoir 

 in the tail to be fully four times the 8ia;<i of the muscular 

 sac of the bladder. 'qrnaria ohiBolenata. he finds to be 

 somewhat liye Ce^nria triaolenata altho the ending of tiie 

 excretory tube is not Tiuite so definite. 1 feel quite 

 oortain that he oonfusd the tail excretory parts with the 

 tiil muscle*. This statement is t>ome out by the fact th*vt 

 in ^ercarim ohi <3 iolei?.ta (1910, fig. 9) he shows the tube in 

 the tail and the ;ausoles of the tail with the gars* type 

 of line arid then loses the exoretory tube in the musclea. 

 This apparent extension of the excretory tube in the tail 

 as ahown in Cercaria qhisolenata and Ceroaria b^flexa, I 

 have observed ia tJie oeroaria of 'Ichinostoraa. revalutuia 

 many times but upon a more careful study the two excretory 

 tubes and pores could also be^seen* This proved to be one 

 of the most difficult points to raa>-e sure about because of 

 these deceptive muscles. That the wide variety 6f excretory 

 parts in the tailof echinoe tomes exists as described by 



