
958 THE AMERICAN NATURALIST. [VoL. XXXVI. 
a, Body broad, piriform; genital pore near median line; 3-4 mm. long ; 
1.5-2 mm. wide: in lung of 7ropidonotus sipedon 
R. variabilis (Leidy) Lühe (21, 53, 77) 
SUBFAMILY RENIFERINÆ. 
. Body elliptical; acetabulum smaller than oral sucker; testes small, 
spherical, in same transverse plane; ovary small, spherical, all three 
being near acetabulum in center of body; genital pore median, in 
front of acetabulum ; 2.8 mm. long: in intestine of fro 
Distomum quietum Stafford (79) 
. Body elongate, linear ; acetabulum near anterior end; genital pore 
in front of it; testes spherical, in oblique plane, near middle of 
body; uterus voluminous, filling hinder part of body; yolk glands 
between testes and acetabulum; 6 mm. long: in ureter and kidney 
of Boa constrictor . . . . Distomum horridum Leidy (18, 21) 
, Body elliptical, without spines ; acetabulum near middle of body ; geni- 
tal pore close to oral sucker ; testes immediately behind acetabulum ; 
1.8-3 mm. long, o.8-1 mm. wide: in mouth of 7ropidonotus sipedon 
Distomum aniorum Leidy (32) 
a, Body elliptical; testes ovoid, in same transverse plane; ovary imme- 
diately behind acetabulum, which is larger than oral sucker wes in 
middle of body; excretory vesicle wide and long; 3 mm. lon 
intestine of Cottus scorpius . . Distomum furcigerum Olss. dem 
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. SUBFAMILY PLAGIORCHIINE. 
. Body elongate, with minute spines; uterus very voluminous; yolk 
glands a number of roundish masses distributed laterally along the middle 
region of the body ; 2.8—5.5 mm. long, 0.6-1.12 mm. wide : in intestine of 
Tylosurus carribeus . . . . . . . » Distomum nitens Linton (38) 
GENUS BUNODERA. 
Intermediate host the crayfish (Cambarus), in which it is found in cysts 
in ovary and other organs; 1 mm. long 
B. nodulosa Zed. (Fig. 45) (98, 35) 
GENUS HA&MATOLCCHUS. 
Acetabulum very small : in lung of frogs 
H. variegatus R. (Fig. 55) (20, 21, 97, 79) 
: GENUS OSTIOLUM. 
Acetabulum minute; body elongate; meus limb of excretory vesicle 
very long ; 7-11 mm. long, 1.5 mm. wide: gs 
0. oiii Pratt (Fig. 56) (77) 
