54 W. N. F. WOODLAND 



anterior (iiid of the body and returns on itself foiming a loop, 

 then crosses posteriorly to the left side of the ovary, and again 

 returning on itself (making a short posterior loop to the left 

 of the ovary) runs forward and opens on the left ^ side of the 

 proboscis at the anterior extremity, and (h) the sperm ducts 

 lie dorsal to the uterus where they cross. These two features 

 are apparently common to all three species of Amphilina, and 

 we may therefore assume for all three species that when the 

 animal is so placed that the proboscis is directed away from 

 the observer and the uterus arises from the right side of the 

 ovary, we are then viewing the animal from the dorsal 

 aspect. 



I will first briefly describe the genitalia of A. paragono- 

 pora. PI. 3, fig. 8 shows the general disposition of the 

 genitalia, and the three diagrammatic sections the relative 

 positions (dorsal and ventral) of the various organs relative 

 to each other. PI. 3, fig. 10 shows the arrangement of the 

 various ducts in the neighbourhood of the ovary. The oviduct 

 (ovd) arises from the ovary towards the right posterior corner 

 and, as shown, soon opens into a small spherical chamber, the 

 fertilization chamber (fc), into which also opens the sHght 

 terminal dilatation of the vagina, the receptaculum seminis 

 (rs). The fertihzed eggs then escape from the fertilization 

 chamber by an opening situated close to that of the oviduct, 

 which leads into what may be called the zygote or fertilization 

 duct (zd). The zygote duct shortly receives the common 

 vitelline duct (vd) and then dilates shghtly to form the recepta- 

 culum vitelli (rv), after which its walls become thickened and 

 glandular to form the shell gland (shgl), and this portion of the 



^ Wagener figures the opening in A. foliacea as lying on the same 

 side of the proboscis as the first limb of the uterus, but if this was the 

 case his specimen must have been abnormal, since Salensky, Cohn, and 

 Hein all figure it on the opposite side in this species, and the openmg 

 lies on what I designate the left side in A. liguloidea, A. magna, 

 and A. paragonopora. It is a pity that Braun (Bronn's ' Thier- 

 reich', Bd. iv, Abt. 1 b, 1894-1900, p. 1155) and Benham (Platyhelmia 

 in Lankester's ' Treatise on Zoology ', part iv, 1901, p. 100) should have 

 popularized Wagener's figure of A. foliacea. 



