21 
narrower. There seem to be no special shell-glands present.“ And 
on the outline of the genital apparatus (1. c., text-fig. 54) no trace 
of any dilation or change can be seen where the accessory vesicle 
(„acc.“) is indicated. Laidlaw’s statement: „The accessory vesicle 
of the female apparatus opens to the exterior through the antrum 
femininum" must, therefore, probably be considered as a derivation 
of the ductus vaginalis from Langs glandular vesicle (= „acces¬ 
sory vesicle"). 
Yeri and Kaburaki (1918, p. 8) introduce another species 
of the genus Bergendalia; B. diversa from Japan (prov. Awa) and 
describe the female apparatus (1. c., text-figs. 7 and 8) as follows: 
„The female aperture leads into the vagina which is extensively 
surrounded by numerous shell giands 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. It then 
bends backward, becomes gradually narrowed, and is soon joined 
on the ventral side by the single uterine duet coming from behind. 
Beyond this point the vagina runs backward and downward, de- 
scribing an arched course, which part is known by the name of 
vaginal duet. 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 duet together form a 
nearly complete, irregular circle. The unpaired uterine duet is very 
short and divides posteriorly into two tubular uteri." 
Cryptophallus wahlbergi Bock 1913 from South Africa (Port 
Natal) belongs without doubt to the family Stylochidae. As in 
Bergendalia, there is only a single female sexual pore. The vagina 
(sensu stricto) is of the Stylochus-iypQ and the narrower ductus 
vaginalis, which is a little shorter, unites with the vagina in its 
most distal part, just above the female gonopore (Bock, 1913, 
p. 123, text-fig. 13). 
Tripylocelis with the species T. typica Haswell from N, S. Wales 
(Port Jackson) possesses a short ductus vaginalis, which opens inde- 
pendently a short distance back of the normal female orifice. 
Haswell describes the female apparatus as follows (1907, p. 467, 
PI. 35): „The chief (anterior) female aperture leads into an ootype 
of long-oval form with greatly plicated walls. At its anterior end 
this bends back and passes into the dorsal limb of the vagina. 
