I 
31 
Type. — U. S. P. H. & M. H. S., No. 9834, two worms mounted in toto on one 
"slide; cotypes in sections. Alcohol material in IT. S. National Museum and in 
collection of American Society of Tropical Medicine. 
Source of material. — A bottle ol material collected by Doctor 
Wellman in Benguella, West Africa, and s^nt to us for determina- 
tion, contained portions of the “ pectoral muscles of a partridge, 
Francolinus suhtorquatiisF The muscles are beset with a number of 
small cysts, about 1.0 mm. long, which bear a superficial resemblance 
to the sarcosporidia occasionally found in birds. Upon careful teas- 
ing, as well as upon section, the cysts are seen to contain minute 
agamic distomes, apparently one parasite in each cyst. 
Significance of infection from standpoint of food inspection. — 
As will be seen from the folloiving account of the anatomy, this para- 
site does not correspond to an}" species thus far known to occur in 
man. Whether it would develop in man further if taken in the 
food can not be stated at present. From the standpoint of food 
inspection the infection would for the present be similar to a severe 
infection with sarcosporidia, namely, an infection not dangerous to 
man, but one which so altered the condition of the meat as to lead 
to its condemnation. 
At the present moment this infection is not known for partridges 
in the United States. 
I 
EXTERNAL CHARACTERS. 
Measurements. — The parasites vary in size, attaining 0.352 to 
0.416 mm. in length by 0.246 to 0.272 mm. in transverse diameter, 
and 0.147 mm. in dorsoventral diameter. 
Color. — The unstained alcoholic specimens are of a yellowish gTay 
color, with two longitudinal lighter fusiform spots, due to the in- 
testinal ceca. In transmitted light the worm has the appearance of 
a small amount of foam, this foamy appearance being due to the 
cellular structure. 
Form. — The^ worms are oval in outline, with flat venter and con- 
vex dorsum; the oral (cephalic) and aboral (caudal) margins are 
bluntly rounded and of nearly the same form; the lateral longitu- 
dinal margins are convex. 
Surface. — No spines could be distinguished on the cuticle. 
Oral sucker. — The oral sucker is ventrosubterminal, 32.2 ix in 
diameter, and directed from dorsocaudal to ventrocephalad. 
Ventral acetabulum. — The ventral acetabulum may be exactly 
in the equatorial plane, or slightly caudad of equator; it is 41 to 
46 /X in diameter, with a circular aperture of 13.8 /x; on section it 
is 38.8 /X in dorsoventral diameter. 
Genital pore. — Halfway between the acetabulum and the caudal 
24800— Bull. 40—08 3 
