212 J. GRAHAM KERR. 



Plate X. 



Fig. 1. View of penis and sac of Needham from posterior (ventral) aspect. 

 The outer wall has been removed so as to show a and b — the 



right and left halves of the penis. 



c, sac of Needham ; d, corresponding structure of left side ; 



e, bristle passing through opening of vas deferens into sac of 



Needham. 

 Fig. 2. Spermatophore-receiving apparatus of an adult female with sper- 



matophore (s) in situ. In this specimen the laminae of the organ 



were continuous across the middle line. 

 Fig. 3. The same organ in its more usual (paired) form. 



