
906 THE AMERICAN NATURALIST. [Vor. XXXVI. 
7, Hinder end of body telescopic (with appendix). 
Jı Body elongate, finely ringed. 
&,. Yolk glands spherical, behind ovary; ap- 
pendix either long, medium, or short; 
receptaculum seminis large 
Hemiurus R. (Fig. 90) (44, 55, 57, 76) 
kə Yolk glands composed of three or four long, 
involved tubes on each side; appen- 
dix long 
Lecithocladium Lühe (Fig. 91) (55) 
J, Body fusiform or ovate; not ringed. 
kı. Yolk glands spherical, near acetabulum ; 
excretory crura do not join anteriorly ; 
testes in same transverse plane; appen- 
dix very short 
Pronopyge Lss. (Fig. 92) (44) 
k,. Yolk glands deeply lobate or tubular, be- 
hind testes. 
Z4. Yolk glands apparently joined to form 
a single star-shaped body 
Lecithaster Liihe (Fig. 93) (55) 
l» Yolk glands distinctly separate from 
each other, and each composed of 
three or four tubular lobes 
^ Lecithochirium Lühe (Fig. 94) (55) 
£» Genital pore on left edge of body nearly opposite acetabu- 
lum ; but one yolk gland present, a small ovoid structure 
in center of the body; testes in same transverse plane: 
in fish . Subfamily XXVI. Zoógoninz 
h,. Testes jum back of E ARU yolk gland just in 
front of ovary . .  Zoógonus Lss. (Fig. 95) (47) 
ñ, Testes one on each side of acetabulum; yolk glan 
just behind ovary 
Zoógonoides Odh. (Fig. 96) (79) 
d, Ovary between the testes, which are often one behind the other. 
4,. Genital pore in front of acetabulum; suckers large; cesopha 
and intestinal coca long; testes and cirrus sac large; yolk 
glands extensive, along entire sides of body : 
Spzrostoma R. yos ig. 97) (44, 86) 
*,. Genital pore behind acetabulum. 
Jı Genital pore at hinder extremity of body; cesophagus absent; - 
yolk glands voluminous: in birds and bats 
Subfamily XXV. Urogonimine 
£i. Suckers very gi testes obliquely behind each other; 
_ body broad rogonimus Mont. e ig. 98) (44) 

