472 
Testes divided into eight long, tubular, un- 
branched lobes which are arranged radially from 
posterior end of vas deferens at base of fore- 
body, the length of the lobes varying from 0.5 
to 1.3 mm, and the width from 0.09 to 0.15 mm 
in the type. Vas deferens winding forward along 
with metraterm and opening together with lat- 
ter ventral to oral sucker. 
Ovary tubular, slender, irregularly ramified 
in the central region, sending slender branches 
into each marginal lobe. It is not possible to 
make out how many branches there are, because 
•of their being intertwined with uterine coils 
and vitelline tubules. In Didymocystis the ova- 
rian tubules are confined to a particular portion 
of the hindbody, but in the present genus they 
extend throughout the hindbody without being 
confined to a particular region. Receptaculum 
seminis retort-shaped, 0.25 mm in diameter, 
.situated near the point where the main ovarian 
tubes meet and join the vitellarian stem. Vitel- 
laria divided into numerous branches, which 
finally reach the peripheral area of the hind- 
body, where they form loops ending blindly. 
Uterus strongly convoluted, looping back on 
itself many times close to surface of each mar- 
ginal lobe as well as on other sides, but not 
forming a definite egg reservoir before leading 
into metraterm. Metraterm well provided with 
circular muscles, running straight forward in 
intercecal field of forebody. Eggs small, some- 
what bean-shaped, thimshelled, 12.5-15 X 7.5 p. 
DISCUSSION: This new genus is character- 
ized by the peculiar shape of the hindbody 
which is usually lobed on one side, the mul- 
tiple testes being radially arranged in the an- 
terior part of the hindbody, and the ovary, 
uterus, and vitellaria being intertwined through- 
out the hindbody. It is defined as follows. 
Lohatocystis n. gen. 
GENERIC DIAGNOSIS: Didymozoidae, Didy- 
mozoinae. Forebody scoop-shaped, hindbody 
flattened into triangular form, with one margin 
PACIFIC SCIENCE, Vol. XIX, October 1965 
usually lobed and the other two margins 
straight. Oral sucker contiguous with pharynx; 
esophagus slender, bifurcating at level of wid- 
est part of forebody. Ceca probably terminating 
near posterior end of hindbody. Testes divided 
into eight long, unbranched tubules radiating 
from junction of vasa efferentia in anterior part 
of hindbody. Vas deferens winding forward in 
forebody along with metraterm and opening 
together with latter ventral to oral sucker. Ovary 
divided into slender branches reaching to pe- 
ripheral area of hindbody. Receptabulum sem- 
inis retort-shaped. Vitellaria tubular, very slen- 
der, branched, intertwined among ovary and 
uterus, though extending mostly in peripheral 
area. Uterus strongly convoluted, occupying all 
available space of hindbody, without forming 
egg reservoir before entering forebody; eggs 
very small, somewhat bean-shaped, thin-shelled. 
Encysted in pairs in gill arch of marine teleosts. 
TYPE SPECIES: L. yaito n. sp., in Euthynnus 
yaito; Hawaii. 
9. Allonematobothrium epinepheli 
n. gen., n. sp. 
Fig. 10 A-E 
HABITAT: Encysted in pairs in fins and un- 
derside of operculum of Epinephelus quernus 
(local name "hapu’upuu”) ; Hawaii. 
HOLOTYPE: U. S. Nat. Mus. Helm. Coll., S.Y. 
No. 27. 
DESCRIPTION (based on seven whole mounts): 
Body slender, 70-365 mm long, up to 0.6-1.0 
mm wide at irregular intervals where the 
ascending uterus is distended with eggs, some- 
what swollen in acetabular region, blunt-pointed 
at posterior extremity. Oral sucker terminal, 
well developed, 0.21-0.3 X 0.24-0.3 mm, di- 
rectly followed by a funnel of transverse muscle 
fibers which in turn is surrounded by dense 
mass of glandular cells. Esophagus 0.5- 1.0 mm 
long, provided with a layer of glandular cells 
appearing like accompanying cells, as is the 
very beginning of the intestinal limbs for a 
distance of about 0.2 mm in the type 183 mm 
Fig. 10. Allonematobothrium epinepheli n. gen., n. sp. 10 A, anterior extremity of holotype, ventral view. 
10B, region of anterior part of testes of holotype, ventral view. IOC, region of anterior part of ovary of holo- 
type, ventral view. 10D, region of genital junction of paratype. 10E, posterior extremity of holotype, lateral 
view. 
