468 
comparatively wide, terminating at different 
levels near posterior extremity. Acetabulum 
wider than long, 0.23-0.42 mm in transverse 
diameter, situated in posterior half of anterior 
third of body, with a pair of muscular, auricu- 
lar, ventrolateral lobes immediately behind; 
each of these lobes is constricted near its ante- 
rior end, 0.27-0.73 mm long, widest at middle 
of elliptical posterior portion; each lobe con- 
sists almost exclusively of dorsoventral muscle 
fibers, but some fibers which are located close 
to the point where the lobe is attached to the 
body are continued into the body parenchyma, 
so that the postacetabular lateral area of the 
body shows a dense marginal layer of strong 
transverse muscles. 
Testes rounded, 0.1-0.26 X 0.11-0.3 mm, 
directly tandem in ventral part of midregion of 
body. Seminal vesicle saccular, up to 0.13 mm 
wide immediately in front of anterior testis, 
whence it tapers and passes into a much coiled 
tubular portion. Pars prostatica 0.12-0.35 mm 
long, surrounded by a dense coat of prostate 
cells which is well delimited from the sur- 
rounding parenchyma. Ejaculatory duct follow- 
ing pars prostatica long and narrow, uniting 
with uterus at base of hermaphroditic pouch. 
Hermaphroditic duct muscular, smooth, convo- 
luted in hermaphroditic pouch, up to 0.4 mm 
long when fully everted; hermaphroditic pouch 
elliptical to pyriform, 0.08-0.26 X 0.06-0.2 
mm, with comparatively thin walls of mainly 
longitudinal muscle fibers, a little posterior to 
intestinal bifurcation; genital pore midventral, 
0.44-0.83 mm from head end. 
Ovary divided into four spherical to oval, 
subequal lobes, measuring 0.13-0.4 mm longi- 
tudinally as a whole, situated ventrally at 
posterior part of middle third of body. Seminal 
receptacle voluminous, inverted retort-shaped, 
0.08-0.4 mm in transverse diameter, situated 
immediately anterodorsal to ovary with its dis- 
tal end produced backward. Shell gland complex 
immediately posterodorsal to ovary. Vitellaria 
divided into two rosette-shaped groups which 
are united together by a longitudinal collecting 
duct passing between the two ventral ovarian 
lobes, each group consisting of six or seven di- 
gitiform lobes totaling 12 or 14; anterior group 
PACIFIC SCIENCE, Vol. XIX, October 1965 
overlapping ovary and seminal receptacle; pos- 
terior group ventral to shell gland, with for- : 
wardly directed lobes overlapping ovary. Uterus 
descending near ventral cuticle down to cecal 
ends where it turns dorsad and ascends dorsal to 
the descending portion, ovary, seminal recep- 
tacle and testes. Anterior to the testes it runs 
alongside the male duct and finally joins the lat- 
ter at base of hermaphroditic pouch where it is 
provided with a small sphincter. Uterine eggs 
numerous, elliptical, operculate, embryonated, 
25-30 X 12-16 /i in life. Excretory vesicle cyl- 
indrical, 80 X 70 /x in lateral view in the type, 
with terminal pore; divided anteriorly into two 
wide lateral arms running forward and reaching 
to oral sucker or pharynx where they unite dor- 
sally. In the young specimen 3 mm long the two 
lateral excretory arms are in direct contact with 
each other in median line behind the acetabu- 
lum. 
DISCUSSION: From the internal anatomy of 
the genitalia it seems certain that this genus is 
related to Lecithasterinae Odhner, 1905. On the 
other hand it bears a certain resemblance to 
Accacoeliidae Looss, 1912, in which, however, 
the excretory stems are located dorsally and 
ventrally in the hindbody but laterally in the 
forebody and not united anteriorly. The paired 
postacetabular flaps should be regarded as an 
accessory adhesive organ without great taxo- 
nomic importance. I prefer, therefore, to pro- 
pose a new subfamily Quadrifoliovariinae and 
place it near Lecithasterinae Odhner, 1905 and 
Trifoliovariinae Yamaguti, 1958. 
Quadrifoliovariinae n. subf. 
SUBFAMILY DIAGNOSIS: Hemiuridae. Body 
long, slender, smooth. Preoral lobe prominent. 
Oral sucker and pharynx well developed; ceca 
terminating near posterior extremity. Acetabu- 
lum anterior, with a pair of muscular accessory 
adhesive flaps immediately behind. Testes tan- 
dem, ventral, in midregion of body. Seminal 
vesicle winding, prostatic cells well developed, 
both between acetabulum and anterior testis. 
Ductus hermaphroditicus enclosed in hermaph- 
roditic pouch. Genital pore postbifurcal. Ovary 
distinctly lobed, ventral, posttesticular; seminal 
receptacle present. Laurer’s canal? Vitellaria 
