No. 431.] NORTH-AMERICAN INVERTEBRATES. gol 
m,. Genital pore behind and to left of acetabulum; 
cirrus sac U-shaped: in snakes 
Opisthogonimus Liihe (Fig. 58) (50, 10) 
A, Genital pore at the extreme anterior or posterior end of the body. 
4. Genital pore in front of or at side of oral sucker 
Subfamily XX. Cephalogoniminz 
Jı Testes one behind the other; cirrus sac very long. 
&,. Excretory vesicle large, with long stem and crura, both 
of which throw out side branches; genital pore in 
front of oral sucker 
Cephalogonimus Poir. (Fig. 59) (44) 
&,. Excretory vesicle with long stem, short crura, and 
without side branches ; genital pore at right of oral 
sucker: in fish Emoleptalea Lss. (Fig. 60) (44, 45) 
J». Testes in nearly same transverse plane and lobate; genital 
pesi at left of oral sucker ; ovary lobate: in birds 
Prosthogonimus Lühe (Fig. 61) (50, 10) 
fə Genital pore at extreme hinder end of body; testes and ovary 
in median line, the latter just behind acetabulum, the former 
just in front of cirrus sac with the uterus between: in bats 
Urotrema Brn. (9) 
£». Ovary not immediately behind or at side of acetabulum; intestinal 
coeca extend to end of body. 
Jı. Genital pore in front of acetabulum and median; yolk glands 
small, being spherical, lobate, or dendritic bodies near the middle 
of the body. 
í Yolk glands spherical ; excretory crura join near the pharynx; 
acetabulum large . Liopyge Lss. (Fig. 88) (44) 
7,. Yolk glands lobate or dendditic: 
Jı- Pharynx absent; yolk glands us = lobate : in urinary 
bladder of cold-blooded vertebra 
Shamil XVI. Gorgoderinz 
kı- Body elongate; either one pair of testes or four testes 
on one side and five on the other 
Gorgodera Lss. (Fig. 62) (44) 
k,. Body broad and leaflike; one pair of testes 
Phyllodistomum Brn. (Fig. 63) (8) 
Ja Pharynx present ; body broad and leaflike; testes either nu- 
merous or two in number Subfamily XV. Anaporrhutinz 
A,. Testes made up of a large number of small bodies; yolk 
glands small and dendritic; uterus not laterad of 
intestinal ceca Anaporrhutum Ofen. (Fig. 64) (67) 
E, Testes two large, lobate bodies; yolk glands lobate; 
uterus extends laterad of intestinal coeca: in turtles 
Plesiorchorus Lss. (Fig. 65) (46) 
