BY WILLIAM A. HASWELL. 435 



EXPLANATION OF PLATE XXII. 



e..s., ejaculatory sac. l.v.d., left vas deferens, r.v.d., right vas deferens. 

 ves., vesicnla seminalis. 

 Fig. 1. — Temnocephala tasmanica : outline of tentacles; from a living 



specimen. 

 Fig. 2. — T. tasmanica : penis and neighbouring parts; from dorsal side. 

 Fig. 3. — T. aurantiaca ; penis and neighbouring parts; ventral aspect. 

 Fig. 4. — T. cceca: penis and neighbouring parts; from the dorsal side. 

 Fig. 5. — T. fasciata: portion of a horizontal section in the plane of the 



duct (dt.) connecting the anterior (a.t.) with the posterior testis 



(p.t-). 



