128 
is directly connected with the change in the epithelium; the mus- ■ 
cular Wall and the basal membrane remain unchanged. On account I 
of the difference in height of the epithelial cells, a spiral-shaped I 
ridge protrudes into the vagina, and thus we have here a decided I 
similarity to the condition met with in Bergendalia anomala Laidlaw I 
and diversaYQvi and Kaburaki, I 
Laidlaw says (1903 a, p. 312): I 
„The female apparatus is no 
less remarkable than that of 
the male. The vagina, va., I 
runs forward for some little m 
distance from the aperfure, | 
then turns upwards. As it does 
so, it is twisted inio a remark¬ 
able spiral coil, making some 
five complete turns. it then ' 
runs back’vaids, narrows con- 
siderably. and scon receives 
the openings of the two uteri, 
ut, on ils ventral side. Beyond 
this point it is continued back 
as a narrow accessory vesicle, 
acc. ves., about as far as the 
\q\ A of the female aperture, 
when it turns sharply ventral- 
wards and opens to the ex- 
terior by the antrum.“ 
„The rest of the terminal j 
female duets are precisely I 
similar in character to the first part of the vagina, only narrower. ] 
There seem to be no special shell-glands present." j 
Yeri and Kaburaki State (1918, p. 10) that the vagina in B. * 
diversa „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 proceeds backward gradually narrowing, ^ 
and is soon joined on the ventral side by the single uterine duet 
Corning from behind." Judging from the schematic text-figure, a „spiral 
coil" seems to have‘arisen here in a way similar to that in Cr. 
o 
Text-fig, 17, Cryptophallus sondaicus. 
Posterioi’ part of the pharyngeal pocket. 
php, with pharynx; ph, the course ot the 
young uteri; u, the ovaries; ov, and the 
sexual openings. 21 x. 
