898 THE AMERICAN NATURALIST.  [Vou. XXXVI. 
4. Genital pore on a muscular suckerlike 
papilla at posterio-lateral side of acetab- 
ulum; œsophagus long; yolk glands 
small: in mammals 
Cotylogonimus Lühe (Fig. 42) (50, 10) 
ña. Yolk glands compact, and lobate or tubular; worms oval 
or elliptical in shape; suckers large and oft projectinge 
testes in extreme hinder end of body ; cirrus sac long: 
Th OUR o v Subfamily X. Philophthalminze 
4,. Cirrus sac extends back of acetabulum; yolk glands 
tubular, laterad of intestinal coeca: under the eyelid 
of birds . . Philophthalmus Lss. (Fig. 43) (44) 
2, Cirrus sac does not extend back of acetabulum ; yolk 
glands lobate, not laterad of intestinal ceca : in 
cloaca of birds . . Pygorchis Lss. (Fig. 44) (44) 
é,- Uterus extends back of testes, usually to end of body. 
fi. Intestinal cceca long, extending more than half the length of body. 
&1- Ovary immediately behind or at side of acetabulum, or when 
not near it the intestinal ceca do not extend into hinder 
extremity of body. 
h,. Genital pore near the acetabulum or somewhere in front 
of it, but not at the extreme anterior or posterior end of 
body. 
4. Mouth surrounded by papilla-like or long spinelike pro- 
jections . . Subfamily XII. Bunoderine 
Jj; Mouth anomna by six contractile projections ; 
no spines present; uterus consists of a descend- 
ing and an ascending branch, without spinal 
windings : in fish 
Bunodera Rail. (Fig. 45) (44, 86) 
Ja Mouth surrounded by long spinelike projections ; 
uterus winds spirally: in Belone 
Tergestia Stoss. (Fig. 46) (44) 
Z4. No projections surrounding mouth. 
Jy Intestinal cæca usually do not reach the end of 
the body (longest in Opisthioglyphe) ; body usu- 
ally spiny; excretory canal usually Y-shaped; 
cirrus sac present 
Subfamily XI. Plagiorchiine 
£,. Uterus does not extend back of testes; oesoph- 
| ids ovary at side of acetabulum: in 
amphibian. 
Opistiogyphe ay (Fig. 47) (44) 
E, Uterus extends back of 
fae (Esophagus ree ey 


