101 
deep. The main gut has a large calibre and the non-anastomosing. bead- 
like, thick-walled side-branches are stout and densely arranged. They do 
not possess ventral pouch- 
es as in Leptostylochus. 
As in most Stylochus- 
species, the testes are 
ventral, the ovaries dorsal. 
Both approach the muscle 
Wall of the body. The 
testes are much more 
sparsely distributed than 
the ovaries. 
As can be observed on Plate III, Fig. 5, several canals occur 
on each side of the pharynx. Taking a caudal course, these sooner 
or later join each other. As they are abundantly filled with eggs, 
they are very distinet in the mounted specimen. Being ventral to 
the intestinal coeca, their location makes it evident that this branched 
system of canals corresponds to the normal unbranched uteri of 
other Stylochids. The 
feature in question is 
not, however, new for 
the family, as I have 
previously mentioned 
the same condition in 
another species of 
Stylochus, orientalis 
Bock and its variety 
splen dida (Bock 1913, 
Figs. 2 a and 3, Taf. 
V) and I have, furth- 
ermore, observed it 
in some other Stylo- 
chus-speciQS from my 
Pacific journeys. In 
the description of these forms I shall treat. this question more 
extensively. 
The vagina (text-fig. 4) is quite typical, with well-developed 
Shell giand duet and a short pars externa vaginae. It lies at the 
Text-fi 4. Stylochus marmoreus. Schema of the genital 
apparatus. 45 x. de, duclus ejaculatorius; mi, main 
mtestme; p, penis; prv, prostatic vesicle with its radial 
cliambers (the dotted line marks the circumference of 
fhe muscular envelope and the inlerrupted lines 
mdicate the ductules of the extracapsular giand cells); 
s, Shell giand exits; sc, left seminal canal; ue, entrance 
ol the uteri into the vagina; vs, tri-lobed vesicula 
seminalis. 
Text-fig. .3. Stylochus marmoreus. Sagittal section 
through the hinder end of the body to demonstrate 
the location of the male organ and sexual pores 
in relation to the pharyngeal pocket (php). 12 x. 
