83 
ph, pharynx. 
pp, pharyngeal pocket. 
pre, epithelium of the prostate vesicle. 
prm, muscularis of the prostate vesicle. 
s, Shell giands. 
sp, sperma ejaculated into the efferent duet of the vesicula seminalis. 
sph, sphineter fibre of the intestinal branch. 
u, uterus. 
Fig. 1. Anterior part of the animal in cedar-wood oil. 
Fig 2. Part of the longitudinal section through the body to demonstrate the 
vesicula granulorum. 
Fig. 3. Part of a longitudinal section to show one of the false seminal ve- 
sicles with its heavy muscular envelope. 
Fig. 4. The section demonstrates the hinder part of the ductus genito-intes- 
tinalis with its entrance into the intestine. Owing to its curve, the 
epithelial tube of the ductus g. i. is cut twice in the section. 
Fig. 5. The photogram demonstrates in greater enlargement how the ductus 
g. i. pierces the wall of the intestine. The section is next to the one 
represented on Fig. 4. Around the entrance of the duet the intestinal 
wall is remarkably thin. 
Plate II a. 
Explanaiion of lettering. 
a, antrum masculinum. 
bm, basement membrane of the body. 
f, fissure caused by the sectioning. 
ia, unpaired anterior branch of the intestine. 
Im, ventral inner longitudinal muscle layer. 
mi, main intestine. 
ms, muscle wall of the body. 
n, nerve. 
o, ovary. 
p, fleshy penis, 
ph, pharynx. 
php, pharyngeal pocket. 
t, the hardly detectable rudiment of a tentacle. 
te, testis, 
s, sucker. 
SS, Shell sac of the vagina. 
vacc, accessory vesicle of the male apparatus. 
vs, vesicula seminalis. 
Euprosthiostomuni adhaerens n. g. n. sp. 
Figs. 1—4. 
Fig. 1. The typespecimencleared in cedar-wood oil. Dorsal side upwards. loVsx. 
Fig. 2. The same specimen in alcohol from below to demonstrate the sucker 
which is provided with a thick stem. 
G* 
