47 
around the entire body and cerebral eyes forming one single oval 
group, which anteriorly, by means of frontal eyes, connects with 
the zone of the marginal eyes. The pharyngeal pocket is very 
long with numerous side-folds and extends so far backwards that 
it overruns the male organ. Consequently there is a prolonged 
main gut giving off numerous coeca. For a further comparison 
I might only add a short resumé of the copulatory organs of Crypto- 
phalliis. The genital pores are at a great distance from each other 
with the female aperture about Vio the length of the body away 
from the posterior body-margin. There is a pair of false seminal 
vesicles, a prostate giand of simpler construction, and a short, un- 
armed penis without penis-fold. The female apparatus with quite 
a short vagina has a ductus vaginalis. The small male apparatus 
lies underneath the most posterior part of the pharyngeal pocket 
(Bock 1913, Text-fig. 13). The two last sentences express the main 
divergencies. 
To the genus Discostylochus I give the following diagnosis: 
Stylochids with the shape of the body rounded oval. 
Eyes scattered over anterior endwith denser clusters 
across the brain. Small marginal eyes in the prae- 
pharyngeal and pharyngeal zone of thebody. Distinet 
tentacular eye-groups underneath rudimentary ten- 
tacles. Pharynx short and wide. Genital pores close 
to each other but at a pronounced distance from the 
posterior margin of the body. Penis unarmed with 
ductus ejaculatorius and prostate duet fusing near 
its apex. Prostate vesicle large, oval, not chambered, 
far away'from penis. Two distinet false seminal ve¬ 
sicles. Vagina of middle length, equipped with a very 
muscular, expanded ductus genito-intestinalis. 
One species from Hawaii. 
