64 
PACIFIC SCIENCE, Vol. XIX, January 1965 
well marked off from body proper, 42- 100ft 
wide at level of hornlike lateral projections, each 
tipped with a marginal hooklet about 10/x long; 
at this level there is a pair of spines 2 5-3 5ft long 
in form of a V in the dorsal median field with 
acute points directed anterolaterad; immediately 
ventrolateral to this is another pair of very 
slender spines of nearly the same length together 
with the anterior median pair of marginal hook- 
lets; dorsal anchor 40-60/x long from tip of dor- 
sal root to height of curve of blade; dorsal bar 
V-shaped, 2 5-5 0/x transversely from end to end; 
ventral anchor 32 — 5 3ft long from tip of ventral 
root to height of curve of blade; ventral bar 
overlapping dorsal, curved angularly on each 
side of median line, 32— 53ft transversely from 
end to end. It is very interesting to note that 
there is a pair of round windows separated by a 
narrow median string of tissue immediately in 
front of the median bars. Head with two incon- 
spicuous lobes studded with head organs on each 
side. Very conspicuous head glands massed to- 
gether posterolateral to pharynx. Only one pair 
of compact eye spots immediately anterior to 
pharynx. Pharynx 12-20 X 12— 19ft; esophagus 
practically absent. Intestinal limbs united pos- 
terior to testis. 
Testis elliptical, 25-81 X 17 — 42ft, situated at 
junction of middle with posterior third of body. 
Vas deferens running forward ventral to left in- 
testinal limb, distended with sperm, up to 12/x 
wide, and opening into base of cirrus. Cirrus 
narrow, tubular, twisted, sheathed except for 
base and pointed distal portion. Prostatic reser- 
voir tubular or claviform, 6-9f<- wide, immedi- 
ately behind cirrus, with its base directed back- 
wards. Prostatic cells massed together around 
base of prostatic reservoir. 
Ovary retort-shaped, 25-47 X 12—2 6ft, situ- 
ated obliquely immediately in front of testis, 
with its distal end produced anteriorly. Shell 
gland complex rosette-shaped, very conspicuous. 
Vagina very much reduced; its rudiment may be 
recognizable ventral to seminal receptacle. Latter 
oval, 13-23 X 10-1 6g. A large shrunken egg 
70-77 X 37— 39ft was often observed hanging 
out of genital pore, with its posterior polar fila- 
ment 0.18-0.32 mm long enlarged at tip. Vitel- 
laria co-extensive with intestine. 
DISCUSSION: This species is characterized by 
possessing two pairs of spiniform sclerites on 
the dorsal side of the base of the opisthohaptor 
and a pair of round windows behind the scler- 
ites; the vas deferens runs forward ventral to i 
the left intestinal limb without looping around 
it. Of the eye spots there is only one pair, with- 
out exception. Considering all these features 
combined, I venture to propose a new genus, for 
which Neohaliotrema is suggested, because of 
resemblance to Haliotrema in other characters. 
N eohaliotrema n. g. 
GENERIC DIAGNOSIS: Dactylogyridae, Ancyro- 
cephalinae: Body elongate, very small. Opistho- 1 
haptor distinctly set off from body proper, with 
two pairs of anchors, two haptoral bars, small 
number of marginal hooklets and two pairs of 
slender spiniform sclerites, perforated between 
bars and spiniform sclerites by a window which 
is separated into two by a narrow median string 
of tissue. Only one pair of compact eye spots, 
exceptionally a single one, present. Intestinal 
crura simple, united posteriorly. Testis in pos- 
terior half of body; vas deferens distended with 
sperm, running forward ventral to left intestinal 
crus without looping around it. One prostatic 
reservoir present. Cirrus tubular, twisted, swol- 
len at base, partly sheathed, without accessory 
piece. Genital pore median or nearly so. Ovary 
pretesticular, oblong. Vagina rudimentary or ab- 
sent. Receptaculum seminis present. Vitellaria 
co-extensive with intestine. Parasitic on gills of 
marine teleosts. 
TYPE SPECIES: N. maomao n. sp., on Abudef- 
duf abdominalis ; Hawaii. 
6. P seudempleurosoma carangis n. g., n. sp. 
Fig. 6 
HABITAT: Gill and pharynx of Caranx lugu- 
bris ( type host ) , Caranx sexfasciatus, and Myri- 
pristis berndti; Hawaii. 
HOLOTYPE: U. S. Nat. Mus. Helm. Coll., S.Y. 
No. 6, 
DESCRIPTION (based on 30 whole mounts): 
Body flattened subcylindrical, 0.8-1.32 X 0.15- 
0.34 mm, tapered posteriorly. Opisthohaptor 
shallowly constricted off from body proper, trun- 
cate behind, 70-90/z wide, with two pairs of 
dissimilar anchors and 14 marginal hooklets 10- 
