Digenetic Trematodes, I — Yamagtjti 
469 
consisting of two groups of digitiform lobes. 
Uterus first descending ventrally to near poste- 
rior extremity, then ascending dorsally. Excre- 
tory vesicle terminal, bifurcating into wide 
lateral arms united anteriorly. 
Quadrifoliovarium n. gen. 
GENERIC DIAGNOSIS: Hemiuridae, Quadrifo- 
liovariinae. Body slender, tapered at both ex- 
tremities. Oral sucker subterminal, directly fol- 
lowed by muscular pharynx; esophagus short, 
muscular; ceca terminating blindly near poste- 
rior extremity. Acetabulum transversely elon- 
gate, in anterior third of body; postacetabular 
muscular flaps constricted near anterior end. 
Testes directly tandem, in equatorial zone. Vas 
deferens swollen proximally immediately in 
front of anterior testis, but tapered and con- 
voluted as it proceeds anteriorly; pars prostatica 
surrounded by compact layer of prostate cells, 
immediately anterior to winding tubular sem- 
inal vesicle; ejaculatory duct narrow, straight, 
running alongside terminal portion of uterus. 
Ductus hermaphroditicus slender, unarmed, mus- 
cular, extremely long when fully everted; her- 
maphroditic pouch elliptical to oval, thin- 
walled. Genital pore midventral, shortly post- 
bifurcal. Ovary four-lobed, in anterior part of 
posterior half of body. Receptaculum seminis 
voluminous, immediately anterodorsal to ovary. 
Vitellaria divided into two (an anterior and 
a posterior) groups of digitiform lobes, largely 
overlapping ovary. Uterus extending backward 
and then forward dorsal to ovary and testes; 
metraterm not differentiated; eggs elliptical, 
small, embryonated. Excretory vesicle divided 
near posterior extremity into two wide lateral 
arms running forward and uniting dorsal to 
oral sucker or pharynx. Gastro-intestinal para- 
sites of marine teleosts. 
TYPE SPECIES: Q. pritchardi n. sp., in Naso 
unicornis; Hawaii. 
(A posteriorly mutilated specimen of this 
species, collected by Dr. H. L. Ching, stained 
with carmine and mounted in balsam was 
kindly submitted to me by Mrs. Mary Hanson 
Pritchard, together with her sketches and de- 
scription; for these I am greatly indebted, be- 
cause this slide showed the anterior union of 
the excretory arms and the structure of the 
terminal genitalia more clearly than my own 
specimens stained with Heidenhain’s hema- 
toxylin. This is why I prefer to dedicate the 
species in question to our esteemed fellow tax- 
onomist, Mrs. Pritchard. ) 
7. Lobatovitelliovarium fusiforme 
n. gen., n. sp. 
Fig. 6 
HABITAT: Intestine of Ablennes hians (local 
name "aha’aha”) ; Hawaii. 
HOLOTYPE: U. S. Nat. Mus. Helm. Coll., S.Y. 
No. 25. 
DESCRIPTION ( based on six whole mounts ) : 
Body fusiform, small, with posterior extremity 
projecting in form of a truncate cone, 0.72- 
1.13 mm long, 0.35-0.47 mm wide at level of 
acetabulum. Cuticle thick, smooth. No eye spots. 
Oral sucker subventral, 70-110 X 80-140 /x, 
surmounted by inconspicuous preoral lobe, di- 
rectly followed by muscular pharynx 23-80 \x 
long by 39-90 /x wide. Esophagus about 50 /x 
long, forming a barrel-shaped thickening of 
circular and longitudinal muscles posteriorly; 
ceca simple, passing dorsal to testes, opening 
into cloaca close to posterior extremity. Acetab- 
ulum large, largely postequatorial, 0. 3-0.4 mm 
in diameter, with transversely elongated oblong 
aperture, the anterior and posterior margins of 
which are provided with semicircular lamellar 
muscle fibers. 
Testes oval to elliptical, 0.1-0.21 X 0.07- 
0.15 mm, situated symmetrically one on each 
side of acetabulum. Seminal vesicle ovoid, 0.14- 
0.2 X 0.1-0.11 mm, medial to right cecum 
anterior to right testis and acetabulum, with its 
anterior end tapering anteriorly and passing 
into pars prostatica dorsally. Pars prostatica 
short, running dorsoventrally behind intestinal 
bifurcation and surrounded by prostate cells 
which form very thick compact layer, sharply 
delimited from the surrounding parenchyma. 
Neither ejaculatory duct nor cirrus differen- 
tiated. Genital atrium sucker-like, with midven- 
tral opening immediately behind intestinal bi- 
furcation. 
Ovary divided into four rounded to oval 
lobes, measuring 60-150 X 130-190 fx as a 
whole, situated between two cecal ends, with 
