30 
When the bulbous portion of this papilla is retracted (fig. 41) the 
large parenchymatic cells assume a rather deep position and might 
easily be interpreted as glandular cells; further, the retracting mus- 
cles arrange themselves in such a way as to give to the structure a 
remarkable resemblance to a partially formed cirrus pouch such as is 
described by Looss (1896b, p. 28, fig. 14) for Gastrodiscus segyj^tiacus. 
Egg. — The uterine egg (fig. 44) is oval in form and white in color 
b}^ reflected light under a low power. With a slightly higher magni- 
fication by transmitted light it is seen to contain a dark, granular 
mass, with a circular area, somewhat eccentrically placed; this ap- 
pears almost free of these dark granules; with still higher magnifi- 
cation it is noted that the eggshell is rather thin in the equatorial zone, 
but slighth" thicker at the poles. At one pole the shell is provided 
with a small operculum ; at the other pole, which at first appears to 
be somewhat less blunt, but which in reality is slightly more so, tliere 
is a small knob. The contents of the egg are inclosed in a membrane 
which with a high magnification does not appear to be in direct con- 
tact with the shell. The average measurements of 27 eggs were 
132.2 /X in length, b}^ 74.5 ix in width; the extremes were 125 and 
139 /X in length and 67.5 and 86 /x in breadth. 
Excretory system. — The excretory vesicle is situated dorsad of the 
acetabulum in the caudal rounded portion of the body. A little 
caudad of the cecal ends of the intestinal tubes it receives two large 
lateral excretory canals, which can be traced some distance cephalad. 
From the vesicle a canal passes caudodorsad to open in the median 
line of the dorsum about at the level of the center of the acetabulum. 
The canal is lined by a cuticle in anatomical continuation with that 
of the surface. 
AGAMODISTOMUM NANUS new species. 
(Figs. 45 to 66.) 
Specific diagnosis. — Apamodistomum : Minute distomes 0.35 to 0.412 mm. 
long, 0.246 to 0.27 mm. broad, 0.147 mm. thick ; oval, venter flat, dorsum convex, 
cephalic and caudal margins blimtly rounded, lateral margins convex. Appar- 
ently without spines. Oral sucker subterminal, 32 /x. Acetabulum slightly 
larger, 41 to 46 (x, in equatorial plane of body. Genital pore median, about mid- 
way between acetabulum and caudal margin (compare Clinosto m um) . riiaryiix 
apparently present; postpharyngeal esophagus very short or wanting; bifur- 
cation 92 fx from center of mouth ; ceca fusiform extending beyond genital 
pore, may extend nearly to caudal margin. Primordium of cirrus pouch (?) 
large and prominent, extending nearly straight dorsad, between ceca ; one 
genital primordium dorsocaudad of this, another caudad, near caudal margin. 
Excretory pore dorsosubterminal ; primordium of excretory vesicle present ; at 
least two excretory canals present. 
Habitat. — Encysted in pectoral muscle of African partridge {Francolinus 
3uJ)torqiiatus) at P>enguella, West Africa. 
