63 (52) Seminal bursa present as either a definite walled structure (Fig. 137), or as a network of syncytial tissue in the 



parenchyma (Fig. 138) 64 



Figure 137. — Bursosuphia baltaUmaniaformia. 



Figure 138. — Archaphanostoma hislobursaUum. 



63 (52) Seminal bursa lacking 79 



64 (63) Seminal bursa an extensive syncytial area in the posterior end of the body with bundles of sperm scattered 

 therein (Figs. 139, 140, 141) Genus Archaphanostoma. 



Figure 139. — Archaphanostoma agile. 



Figure 140. — Archaphanostoma macrospiriferum. 



64 (63) Seminal bursa a definite walled structure .... 



Figure 141. — Archaphanostoma histobursaiium. 



.65 



42 



