Description of Some Japanese Polyclad Turbellaria. 



Textfig. 3. Eye-spots of Stylechu* 

 ijimai. 



pi- 



ed am ft if> sgp 



Textfig. 4. Diagrammatic combination figure of the genital 



end-organs of St. ijimai, as seen from the dorsal side. 

 Textfig. 5. Seuii diagrammatic representation of the genital 

 end-organs of St. ijimai in sagittal section- 

 A anterior, am antrum musculium, ec egg-canal, 

 ed ejaculatory duct, P posterior, p penis, jr prostate, 

 sc seminal canal, ■*(/ shell gland, sgp shell-gland passage, 

 sv seminal vesicle, u uterus, ft male genital aperture, 

 iji female genital aperture. 



Tentacular eye-spots arranged close 

 together on tentacles; cerebral eye-spots 

 in two bands on either side of the median 

 line, each band consisting of eye-spots 

 arranged in linear series which slightly 

 diverge anteriorly. Numerous marginal 

 eye-spots not extending all round the 

 bod} 7 , but reaching to about the end of 

 the anterior three-quarters of body on 

 both sides (textfig. 3). 



Mouth placed 

 nearly in the centre 

 of body; male and 

 female genital aper- 

 tures situated close 

 to each other near 

 the posterior body 

 end. 



Genital end- 

 organs (textfigs. 4, 5) 

 are essentially as in 

 the preceding species 

 or in St. orientalis. 

 Seminal canal (sc) of 

 each side communi- 

 cates with the lateral 

 lobe of the seminal 

 vesicle (sv) which is 

 a large trilobed or- 

 gan. The median 

 vesicle gradually 

 narrows behind to 

 continue itself into 

 the ejaculatory duct 

 (ed), which pursues 

 ] backward a tortuous 



sq 



