896 

THE AMERICAN NATURALIST. [Vor. XXXVI. 
7;. Yolk glands entirely in front of acetabulum; 
uterus extends back of ovary to testes 
Holometra Lss. (Fig. 31) (44) 
7. Yolk glands partly behind acetabulum 
Metorchis Lss. (Fig. 32) (44) 
/,. Stem of excretory vesicle usually entirely posterior to testes ; 
cirrus sac present. 
m,. Testes lobate; prepharynx present 
Subfamily II. Omphalometrinz 
nı (Esophagus absent; intestinal cceca do not extend 
into extremity of body; yolk glands meet in 
median line: in Ciconia 
Omphalometra Lss. (Fig. 33) (44) 
7 (Esophagus present. 
o. Acetabulum pedunculate; ovary lobate; ute- 
rus extends in zigzags to genital pore; yolk 
glands meet in median line 
Podocotyle Stoss. (51) 
9, Ovary spherical; acetabulum sessile; uterus 
massed between them; yolk glands laterad of 
intestinal cceca 
Cathaemasia Lss. (Fig. 34) (44) 
m,. Testes not lobate. 
#,. Yolk glands extend in front of acetabulum. 
o, Anterior end with projecting ridges or with six 
papilla. 
f, Body subcylindrical; anterior end with 
four projecting, radial ridges : in turtles 
Calycodes Lss. (Fig. 35) (49) 
f. Anterior end with six papilla, two being 
ventral and four dorsal: in fish 
Crepidastomum Brn. (8) 
o, Anterior end without ridges or papille; body 
road and flat. 
£2, Yolk glands very extensive, overlapping 
intestinal coeca; ovary near testes an 
not near acetabulum: in fish 
Halicometra Odh. (Fig. 104) (7°) 
pe Yolk glands not — intestinal 
Opisthioglyphe Lss. (Fig. 47) (44) 
a,. Yolk glands do not extend in front of acetabulum 
Subfamily VI. Facute 
o, A pair of earlike papillae present near mo 
body elongate. 

