17 
Fig. 12. — Egg of the lung fluke 
showing the ovic cell and a 
number of vitelline or yelk 
cells. Note also the cap or oper- 
culum. X 1,000. (After Kat- 
surada, 1900, p. 507, fig. 3.) 
irregularly to posterior ex- 
tremity. Genital pore, often 
indistinct, close to the caudal 
margin of ventral acetabulum, 
may be in the median line or 
immediately to the right or left 
of it. Male organs: Cirrus and 
cirrus pouch absent; ductus 
ejaculatorius straight; testicles 
tubular, ramified, one slightly 
posterior of other, on each 
side of median line. Female 
organs: Ovary branched, lat- 
eral, right or left of median 
line, somewhat posterior of 
acetabulum and antero-ventral 
of transverse vitello-duct; on 
the opposite side of median 
line, at about the same height, 
is situated a lobate shell gland 
and a rather short, massed 
uterus; in some specimens the 
latter may spread across the 
median .line and partially 
cover the ovary; folds of uterus 
extend ventrally of shell 
gland; vitellaria marginal, 
highly developed, extending 
from anterior to posterior ex- 
tremity, often leaving but a 
small portion of the dorsal and ventral median field uncovered; transverse vitello- 
ducts dorsal; vitelline reservoir large; Laurer’s canal present. Fggs oval, 80 to 100 p 
Fig. 13.— Ventral view of a compressed specimen of a lung 
fluke from a hog. Greatly enlarged. (After Stiles & 
Hassall, 1900, p. 563, fig. 24.) 
diameter, terminal or subterminal in different specimens from the same lung. 
Ventral acetabulum (0.6 to at most 0.75 mm. — Leuckart; 0.78 mm. — Kerbert; 
0.75 to 1.017 mm. — Ward; 0.88 to 1.2 by 0.86 to 1.44 
mm. — Stiles & Hassall) very slightly larger than oral 
sucker; situated somewhat anterior of equator of the body, 
2 to 4 mm. back of oral sucker. Skin provi^led with broad 
scale-like spines. « Pharynx elongate; esophagus very 
short, so that the bifurcation of the intestine is consider- 
ably anterior of the ventral acetabulum; intestinal ceca 
usually somewhat zigzag, some distance from each other, run 
« Largest in the middle of the body, after Leuckart, but larges.t on anterior portion, 
after Kerbert; smallest around moutlq after Stiles & .HassalL 
9 
14167— Vo. 17-04- 
