42 
more attenuate anteriorly than posteriorly, ventral surface flat, dorsal surface slightly 
convex, margins very thin. Oral sucker ventro-subterminal, small, 0.5 mm. in diam- 
eter, 0.33 mm. deep. Ventral acetabulum 1.6 to 2 mm. in diameter, but elongated 
caudally directly under the ventral surface in a 2 to 8 mm. 
long sack; center of acetabulum 1.8 to 2 mm. from anterior 
end of body. Skin without spines. Prepharynx 0.28 mm. 
long; pharynx 0.7 mm.; esoj)hagus very short so that the 
bifurcation of the intestine occurs about on anterior plane 
of acetabulum ; ceca with two characteristic curves toward 
median line, one at equator, the other between the testicles. 
Male organs. — Cirrus pouch cylindrical, median, nearly one- 
fourth as long as the body, 0.25 to 0.33 mm. thick, straight, 
extending from genital pore to about midway to shell gland 
( equator) ; it contains a long sinuous vesicula seminalis with 
a long blind sack possessing lateral branches, this sack reach- 
ing from a short distance caudad of acetabulum to about 0.5 
mm. from caudal end of pouch; pars prostatica 0.5 mm. 
long, ductus ejaculatorius rather short, pro'vuded with fine 
spines; vasa defferentia near median line; testicles one 
posterior of tlie other; branches of posterior testicle extend 
to within about 3 mm. of the caudal end of the body. Female 
organs: Vitelline reservoir rather small; shell gland 1 to 1.5 
mm. in diameter. Fggs numerous, 120 to 130 ^ long by 77 
to 80 broad. Sporocyst, redia, cercaria, and intermediate 
host undetermined. 
Habitat. — Small intestine of man [Homo sapiens); Asia. 
This parasite has ])een reported several times 
for man, all the eases being of Asiatic origin. 
Judging from the writings of Dobson (1893a, 
1893b) and Giles (1892, 1893) this parasite is 
probably more common, especially in India, than 
is generally supposed. 
Rathouis’s Intestinal Fluke — FASCIOLOPSIS RAT- 
HOUISIc (Poirier, 1887) Ward, 1903. 
[Fig. 67.] 
Specific diagnosis. — Fasciolopsis: 25 mm. long, 16 mm. 
broad; Avhitish, tinted witli broAvn on the margins; oblong 
oval, obtuse, anterior end appears to be provided Avith a 
more or less distinct short cephalic cone, 3 to 5 mm. broad. 
Oral sucker (?) subterminal, A'ery small, its opening not 
OA"er 0.5 mm. in diameter (after Moniez), or 1.5 mm. (after 
Braun ) . Ventral acetabulum much larger, situated about 
2 mm. from the oral sucker, its circular orifice 2 mm. in 
diameter. Skin Avithout spines. Prepharynx (?) ; j)harynx 
(?) ; esophagus (?); intestinal ceca (?). Male organs: Cirrus 
pouch (?) (apparently long); A^asa deferentia apparently 
rather divergent; testicles side liy side. Female organs: Ovary caudad of transA^erse 
Fig. 66. — Dorsal view of that 
portion of the cirrus pouch 
which lies caudallj^ of the 
acetabulum: ae., acetabu- 
lum; c. V. s., cul-de-sac of 
the Amsicula seminalis; v. 
d., A’as deferens; v. s., vesic- 
ula seminalis. (After Odh- 
ner, 1902, fig. 3.) 
« Sv'NONYMS. — FIstonmm rafhouisi Poirier, 1887; Fisfoma rathonisii. Huber, 1894 
(misprint); Fasciolopsis rathoiiisi (Poirier) Ward, 1903. 
