428 
Fig. 5. Pseudopterinotrema alubulae n. g., n. sp. 
5 A, Holotype, ventral view; 5B, two-valved sucker; 
5C, anchors on caudal appendage of holotype; 5D, 
cirrus and its accessory sclerites of paratype, dorsal 
view; 5E, egg. 
PACIFIC SCIENCE, Vol. XX, October 1966 
which the right one articulates with the left 
axial sclerite of the seventh clamp and the left 
one articulates with the extreme left ninth 
sclerite. 
(9) Ninth clamp about 0.12 mm long and 
fringed on each side with a row of spines like 
other clamp stalks, but bears one apical clamp 
valve, although it has a two-valved sucker on 
the left side of its base. 
The above mentioned two-valved suckers, 
23-40p wide and seven in all, are arranged 
in a transverse row at the base of the clamps. 
Each sucker has a sclerotized frame consisting 
of four sclerites and appears oo -shaped in pro- 
file. 
Prohaptor circular, 0.2-0.47 mm in diameter, 
membranous, with somewhat crenulated margin 
and a simple middorsal cone 40-70p long and 
40-70p wide at base. Oral sucker 0.11-0.21 mm 
in diameter, opening at bottom of prohaptor; 
prepharynx present; pharynx always lateral to 
oral sucker, cylindrical, 40-60 X 2 0-3 Op; 
esophagus very narrow, 0.3-0.65 mm long. Ceca 
with short branches, terminating separately at 
base of opisthohaptor. 
Testes rounded, up to 25 in number (mostly 
16), arranged in a zigzag longitudinal row, 
occupying greater part of postovarian inter- 
intestinal field. Vas deferens may be strongly 
swollen in preovarian interintestinal field. 
Cirrus plug-shaped, muscular, covered inside 
with spinules, 50-90 X 2 7-5 Op, with two un- 
equal sclerotized filaments at base ; anterior 
filament 50-1 20p long, usually widened distally, 
posterior hook-shaped, 35-60p long, both often 
appressed against cirrus. Genital pore ventro- 
median, 0.06-0.22 mm posterior to pharynx. 
Ovary turned back on itself five times, form- 
ing N -shaped loop posteriorly and double loop 
anteriorly, situated in anterior part of middle 
third of body. The germiduct running forward 
gives off the genito-intestinal duct near its 
origin and soon unites with the descending 
vitelline stem. Uterus largely ventromedian ; 
eggs elliptical, 110-130 X 50-75p, with long, 
very fine filament at antiopercular pole. Vitel- 
laria coextensive with intestinal limbs; vitelline 
reservoir Y-shaped, with long, sometimes short, 
stem, and rather short arms, coinciding with 
ovary. Vagina well cuticularized, with wide mid- 
