ON THE ANATOMY OF HISTKIOBDELLA HOMARE. 359 



Fig. 42.— Horizontal section through the region of the first segment 

 in the male, showing the head of the first nephridium. 

 Fig. 43. — Transverse section through the neck region. 



Fig. 44.— Transverse section through the caudal region, showing ti.e 

 oblique muscles. 



