'SV 



^ 



J 



Fig. I. 

 Microscolex aquarumdulcium (Bedd.). a. Distal end of a penial seta b, x 400. b. Distal end of a penial seta 

 a, X 400. 



Microscolex georgiamis (Mich.), c. Distal end of a penial seta a from a right anterior bundle: the direction of 

 the spiral formed by the three large scales is anti-clockwise, the greater part of the second scale lying on the 

 under side of the seta in the figure, x 400. d. Distal end of an abnormal penial seta b, x 400. e,f. Distal 

 ends of normal penial setae b, x 400. 



Microscolex faklandicus (Bedd.). g. Distal end of a precursory penial seta a, from a right anterior bundle, 

 X 400. h. Distal end of adult penial seta a, from a right posterior bundle; the direction of the spiral formed 

 by the large knobbed scales is clockwise, the scales indicated by dots lie on the under side of the seta in the 

 figure, X 150. i. Extreme distal end of same seta, x 400. j. Distal end of a precursory penial seta b, x 400. 

 k. Distal end of an adult penial seta b, x 400. 



