422 
PACIFIC SCIENCE, Vol. XX, October 1966 
with extremely long, very fine, antipolar fila- 
ment at base, 0.1-0.125 X 0.09-0.115 mm as 
measured in life and in lactophenolglycerin 
jelly. Vitelline follicles extending in lateral 
fields from level of posterior part or end of 
pharynx to base of posterior flap covering opis- 
thohaptor, confluent in median line between 
testes and opisthohaptor, intruding into small 
area between transverse vitelline ducts and 
testes; transverse vitelline ducts united medi- 
anly, forming inconspicuous vitelline reservoir 
only 20-1 10p anteroposteriorly. Vagina open- 
ing ventral to uterus by a very small pore a 
little behind intestinal bifurcation; vaginal duct 
winding along with vas deferens medial to left 
intestinal limb; receptaculum seminis vaginae 
oval, 50-150 X 30-1 lOp, lying between left 
transverse vitelline duct and ootype; seminal 
duct connecting seminal receptacle with vitel- 
line reservoir very short. Excretory vesicle fun- 
nel-shaped, symmetrical, opening dorsally at 
level of intestinal bifurcation. 
discussion/ This genus very closely resem- 
bles Allobenedenia Yamaguti, 1963 in gross 
anatomy, but differs in minor details as shown 
in Table 1. 
The present species differs from P. opakapaka 
to be described below in that the genital atrium 
TABLE 1 
Differentiation of Pseudallobenedenia 
from Allobenedenia 
CHARACTER 
Allobenedenia Pseudallobenedenia 
Frontal hood 
present 
absent 
Cirrus 
long 
extremely 
long 
Genital atrium 
not extremely 
long 
extremely 
long, 
convoluted 
or straight 
Vaginal 
opening 
marginal 
or sub- 
marginal, 
prebif ureal 
submedian, 
postbifurcal 
Receptaculum 
seminis 
absent 
well 
developed 
Vitelline 
reservoir 
saccular, 
very 
distinct 
no definite 
reservoir 
is much longer, often convoluted, and contains 
an extremely long cirrus. The unusually long 
and wide uterus in P. apharei is worth noting. 
2. Pseudallobenedenia opakapaka n. sp. 
Fig. 2 
habitat: Gills of Pristipomoides microlepis 
(local name "opakapaka”) ; Hawaii. 
holotype: U. S. Nat. Mus. Helm. Coll., 
S. Y. No. 46. 
description (based on three whole mounts) : 
Body elongate, distinctly constricted immediately 
behind prohaptor, 3. 0-5. 5 mm in total length 
including opisthohaptor, with maximum width 
of 0.1-0.15 mm at level of testes. Opisthohap- 
tor bell-shaped, 0.6-0. 8 mm in transverse di- 
ameter, provided with a scalloped marginal 
membrane. There are three submedian pairs of 
weakly developed anchors on the inner surface 
of the posterior half of the opisthohaptor; an- 
terior anchor rod-shaped, 40-5 Op long, middle 
and posterior anchors a little apart from the an- 
terior, close together near haptoral margin ; 
middle one somewhat undulating, barbed dis- 
tally, 40-43 p long; posterior one hook-shaped, 
18-25p long. Prohaptor oval, saucer-shaped, 
glandular, 0.21-0.28 mm long; between the 
two haptors is seen the truncate head end level 
with the anterior end of the haptor. Two pairs 
of eyespots anterodorsal to pharynx. Pharynx 
subglobular, without constriction, 42-58 X 52- 
62p. Esophagus very short, surrounded on each 
side by postpharyngeal cells, whose ducts ap- 
pear to open into the pharyngeal lumen close 
to its posterior end. Intestinal limbs with com- 
paratively long, subdivided, outer branches, ter- 
minating separately a short distance away from 
posterior end of body. 
Testes elliptical, juxtaposed at anterior part 
of middle third of body, 0.37-0.7 X 0.17-0.28 
mm, with paired Goto’s glands immediately be- 
hind. Multinucleate organs like Goto’s were 
found immediately in front of the testes and 
beside ovary. Vas deferens convoluted between I 
left intestinal limb and shell gland complex, 
then forming a very long horseshoe-shaped loop 
across uterus and cirrus pouch dorsally, pene- . 
trating cirrus pouch at its anterior base, finally 
joining prostatic duct at posterior end of cirrus I 
pouch. Cirrus pouch cylindrical, 0.2-0. 7 mm 
