20 
VerrilTs two species of Trzgo/zoporws would be desirable. I have 
wondered if possibly the opening indicated as the male aperture 
might represent that of the penis-sheath, and the „anterior 
female opening“ the ouler male aperture; thus the orifice of the 
vagina would correspond to what Ver ri 11 calls the posterior female 
opening, while the orifice of the ductus vaginalis would, in its turn, 
become what has been indicated as the pore for the nephrideal 
duet. At present I am not able to decide this question. 
The genus Bergendalia, with the species B. anomala from Ma- 
lacca north of Penang, is introduced by Laid law (1903, p. 310), 
and is described as „a most remarkable and interesting form, prob- 
ably allied to the anomalous genera Cryptocelides and Polypostia, 
described by Bergendal, and provisionally referred to the same 
Family with them.‘‘ In 1913 I ranged this genus, provided with 
duplicate male organs, close to the family Siylochidae, a procedure 
adopted by Yeri and Kaburaki in 1918. However, it might 
now be right to include Bergendalia in the family Siylochidae, 
although my supposition as to traces of tentacle-rudiments and 
tentacular eyes has not been verified as yet. Laidlaw gives the 
fcllowing description for B. anomala: „The female apparatus is no 
less remarkable than that of the male. The vagina runs forward 
for some little distance from the aperture, then turns upwards. As 
it does so, it is twisted into a remarkable spiral coil, making some 
five complete turns. It then runs backwards, narrows considerably, 
and soon receives the openings*) of the two uteri on its ventral 
side. Beyond this point it is continued back as a narrow accessory 
vesicle about as far as the level of the female aperture, when it 
turns sharply ventral-wards and opens to the exterior by the antrum''. 
„The curious spiral twisting of the vagina is, so far as I know, 
unparalleled in the order“. Laidlaw’s comparison to a „narrow 
accessory vesicle “ cannot be taken strietly, as no expansion oceurs. 
The description of the entire structure of the vagina is followed 
by this statement: „The rest of the terminal female duets are pre- 
cisely similar in character to the first part of the vagina, only 
*) It should be noted that, judging from Laidlaw’s picture as well as for 
theoretical reasons, it is probable that B. anomala, like the B. diversa 
Yeri et Kaburaki, possesses an unpaired median uterine duet; consequently, 
only one opening to the vagina. 
