-46 Art. 3.~T. Kabiiraki : 



groups may be mentioned as in tlie accompanying diagnostic 

 table : — 

 J. Keceptacnlnm semiuis single. 



A. A single genital aperture. Ixeceptacnlum seminis situated posterior to the 



P^i^is Fam. Proceroclidae, 



a}. Penis unarmed. 



a2. Vasa deferentia not fusing together to form a common duct before enter- 

 ing the base of the penis. Intestine showing no sign of anastomosis 



Snbfam. Euprocerodinae. 



a^. Freely living. 



a*. Oviducts opening into the vagina by a distinct duct 



Genus Procerodes. 



b^. Oviducts opening separately into the vagina . . Genus Stinnmeria. 

 P. Ectoparasitic on Limulus. ■ 



Oviducts opening separately into the extremely wide, dorsally pro- 

 longed vestibulum Genus Ectoplana. 



h^. Vasa deferentia incited together into a single ductus deferens before enter- 

 ing the base of the penis. Intestinal branches anastomose 



Subfam. Micropharynginge. 



Ectoparasitic on Baja Genus Microj>/uiti/)Lv. 



b^. Penis pointed or provided with stylet. 



Vasa deferentia united together into a common duct before entering the 

 penis^ or not united. Oviducts opening separately into the vagina. . . . 



• . Subfam. Cercyrinae. 



c^. Vasa deferentia fusing together to form a single ductus deferens in front 

 of the penis, 

 cl Penis with long stylet. Ovaries placed closely in front of the pharynx- 

 insertion Genns Cercijm. 



cf. Penis pointed, without stylet. Ovaries situated behind the brain. 

 Adhesive cells lying dorsally at the anterior end . . Genus Sahussoaia. 

 (P. Vasa deferentia or ejaculatory ducts opening separately very near the tip 

 of the penis. 

 Paired testis placed in front of the insertion of the pharynx. Penis with 

 long stylet. Ovaries nearly midway between the eyes and the pharynx- 

 insertion. Adhesive cells lying dorsally at the anterior end 



Genus Cerbussowia. 



B. Two genital apertures. Eeceptaculum seminis situated between the pharynx 



and the penis Fam. Uteriporidie. 



Eeceptaculum seminis connected by two canals with the oviducts which 

 unite into an unpaired oviduct, before opening into the penis-sheath . . 



Genus Vtcripoius. 



II. Eeceptaculum seminis double. 



Three genital apertures. Eeceptaculum seminis opening by distinct ostia lateral 



