172 
b. Lang’s vesicle paired. 
1. Prostatic vesicle large, horizontal, chambered. Long tentacles 
Vesiciila seminalis. 
Idioplanoides Barbour 1912 
(= Woodworthia Laidlaw 1904). 
2. Prostatic vesicle unchambered, ductlike, of considerable length. 
No tentacular prominences. Vesiciila seminalis\ penis armed or 
unarmed. In fresh or brackish waters. 
Limnostylochus Bock 1913 
(= Shelfordia Stummer-Traunfels 
1902). 
B. Caudal duet of vagina opens into alimentary system (ductus vagino- 
intestinalis). 
a. Prostatic vesicle large, horizontal, unchambered. Large false semi- 
nal vesicles; tentacles rudimentary. 
Discostylochus Bock 1925. 
b. Prostatic vesicle only as a rudiment. No seminal vesicles: tentac¬ 
les rudimentary. 
Enterogonia Haswell 1907. 
C. Caudal duet of vagina runs ventralwards as a ductus vaginalis. 
a. Penis below pharyngeal pocket. Tentacles rudimentary. Prostatic 
vesicle small., vertical, unchambered'., false seminal vesicles. 
Cryptophallus Bock 1913. 
b. Penis behind pharyngeal pocket. Tentacles stout and retractile into 
pockets. Prostatic vesicle large, horizontal, chambered', false se¬ 
minal vesicles. 
Kaburakia n. g. 
c. A duplicate male copulatory organ, No tentacles. Prostatic vesicle 
large, horizontal, ? chambered', vesicula seminalis? 
Bergendalia Laidlaw 1903. 
