M 



Art. 9.— M. Yeri and T. kaburaki 



25 



be c 



cerebral eye-spots in two distinct elongate clusters on either side 

 of the median line (textfig. 24). 



Mouth subcentral ; pharynx much folded. Primary gut- 

 branches occur in about six pairs. 



Testes ventrally situated. Seminal canals (textfig. 25, so) 

 gradually diverge forward until the level slightly anterior to male 

 genital end-organs is reached, where they bend abruptly upward 

 and backward to expand into the accessory seminal vesicle (asv) 

 just before piercing the muscular sheath of the prostate. Within 

 that sheath the canals unite at once into an unpaired median 



canal, the ejaculatory 

 duct (ed), which opens 

 into the duct of the pros- 

 tate (pr). This organ 

 is a large spherical body 

 with muscular sheath, 

 which is directly con- 

 tinuous behind with that 

 of the cirrus cavity (c). 

 The inner surface of this 

 is beset with minute 

 bristles. The male aper- 

 ture is situated in the 

 third quarter of body. 



Ovaries situated 

 dorsally. The two uteri 

 (u) run backward parallel 

 with the median line, 

 and finally open sepa- 

 rately into a median 

 canal, the egg-canal (ec). 

 This canal is posteriorly 

 continuous with the accessory vesicle (av), which is filled with 

 spermatozoa. Anteriorly, it expands into the bursa copulatrix 

 (be), which is provided with a strongly developed muscular sheath 

 and with a more or less folded epithelium. The bursa copulatrix 



ed pr 



Textfig. 25. Diagrammatic combination 'figure of 



the genital end-organs of P. misakiensis, as seen 



from the right Bide. 

 Textfig. 26. Genital end-organs of P. misakiensis 



in longitudinal section. Semidiagrammatic. 



be. bursa copulatrix. 



Other letters as in textfigs. 4, 10, 15 and 18. 



