131 
niuscular wall of the body. The large seminal canals have not been 
examined as to their whole course, but are located in the trans¬ 
verse section slightly back of the mouth, close to the uteri, and 
a short distance laterally to the pharynx. In the distal part they 
run their usual twisting course under the pharynx. With the 
Text-fig. 19. Crifptopliallus sondaicus. Sagittal section of 
Ihe male copulat'ory organ. (38 x. am, antrum masculinum : 
de, ductus ejaculatorius : p, penis; php, pharyngeal pocket; 
pr, epithelium with granular giand cells; x, interrupted line 
indicating tliat the apex of the penis is lacking owing to 
daniage, probably caused during transport. 
musculature increasing in stoutness, they develop into elongated 
false seminal vesicles. The ciliated epithelium of these vesicles is 
high. They are located in the transverse section of the animal. 
The muscularis is principally arranged in circles and increases in 
thickness gradually. Hence they do not give a very distinet im- 
pression of separate organs. Distally toward the entrance to ductus 
ejaculatorius the muscularis decreases somewhat in robustness. They 
merge into one another in the median line a short distance anterior 
to the base of the penis, although they are shifted so far forward 
that they nearly reach the level of the anterior border of the antrum. 
Ductus ejaculatorius runs from the place where the two join a 
short distance caudally, then anterior to the longitudinal axis of 
the penis, through which it later traverses the said organ. The 
musculature of the duet decreases in thickness towards the apex 
of the penis. As the series of sections shows, the differentiation 
of the false seminal vesicles has not gone very far. This may 
partly be due to the faet that full sexual maturity has not been 
reached, but one might also assume that the genital apparatus, as 
regards the organization of seminal vesicles, constitutes a middle 
stage between the condition in species of Stylochus with three- 
9* 
