10 Art. 9.— M. Yeri and T. Kaburaki : 



a space which corresponds to the antrum musculinum and into 

 which the relatively small duplicate penis (p) projects vertically 

 from above. A short distance from it, the ejaculatory duct divides 

 into two, similarly as in the functional male system. The dorsal 

 of the two ducts thus formed passes anteriorly into a prostate-like 

 organ (pr), while the ventral leads into a muscular-walled blind 

 vesicle (sv) corresponding to the seminal vesicle. 



The female aperture (£) leads into the vagina (v) which is ex- 

 tensively surrounded by numerous shell glands and which proceeds 

 obliquely forward and upward for some distance, being twisted at a 

 part of its course into a compact spiral coil of some five turns (s). 

 It then bends backward, becomes gradually narrowed, and is soon 

 joined on the ventral side by the single uterine duct (uu) coming 

 from behind. Beyond this point the vagina runs backward and 

 downward, describing an arched course, which part is known by 

 the name of vaginal duct (vd). This finally opens into the antrum 

 femininum closely behind the vaginal aperture and just inside the 

 external female aperture. Thus the vagina and the vaginal duct 

 together form a nearly complete, irregular circle. The unpaired 

 uterine duct is very short and divides posteriorly into two tubular 

 uteri (u), which run forward on either side outside the seminal 

 canal and are more or less distended by the ova they contain. 



This remarkable and interesting species may be said to closely 

 agree with Bergendalia anomala Laidlaw (10031)) from Penang in 

 all anatomical features, excepting the presence of eye-spots over 

 the head-end surface and the duplicate penial organs being situated 

 in front of, instead of behind, the functional penial organs. In 

 our opinion, the difference may well be regarded as being of not 

 more than spécifie value. The generic diagnosis of Bergendalia, 

 hitherto known by the single species above referred to, should 

 then be slightly modified to run somewhat as follows: 



Graspedommata with elongate body, without tentacles. 

 Marginal eyes in a crowded row or row T s running completely round 

 the body. With or without additional eye-spots distributed over 

 head end. Pharynx large, much folded. Mouth subcentral. Three 



