73 (66) Seminal bursa without a projecting external appendage, but a flattened cap of a few cells (Fig. 156) or an 



invaginated spermatic duct (Fig. 157) may be present 74 



Figure i56. —I'raecunvolula karinae. 



Figure 157. — Poslaphanostoma plum. 



13 (66) Seminal bursa with a definite external cellular or muscular (but not cuticularized) appendage (Fig. 158) 77 



Figure 158. — Proaphanostoma lenuissima. 



14 (73) True seminal vesicle lacking. 

 74 (73) True seminal vesicle present. 



.75 

 .76 



48 



