
w 
t2 
THE AMERICAN NATURALIST. [Vor. XXXVI. 
m Body not spiny; cirrus sac very wide in front of 
acetabulum ; yolk glands composed of a single row 
of follicles on each side: in turtles 
Endiotrema Lss. (Fig. 54) (44, 45) 
. Intestinal ceca reach into extremity of body; testes usually in 
oblique plane or one behind the other. 
k,. Large suckerlike genital papilla present in front of acetabulum ; 
suckers large; excretory crura join at anterior end 
Ptychogonimus Lühe (Fig. 38) (51) 
k,. No genital papilla present . Subfamily XIV. Haplometrinz 
4. Genital pore just behind pharynx; cirrus sac very long and 
rrow. 
m. Acetabulum larger than and near oral sucker; body 
elongate; testes and ovary in forward half of body; 
receptaculum seminis wanting or minute 
Macrodera Lss. (44) 
m,. Acetabulum smaller than oral sucker and not near it; 
uterus very long and deeply colored ; receptaculum 
seminis very large; Laurer's canal wanting ; cesoph- 
agus wanting or short. 
7,. Uterus in long longitudinal folds; ovary beside 
acetabulum : in lungs of amphibians 
Hæmatolæchus Lss. (Fig. 55) (44) 
7, Uterus in transverse folds; ovary behind acetabu- 
lum, which is minute; testes very large: in frogs 
Ostiolum Pratt (Fig. 56) (77) 
4. Genital pore near acetabulum. 
m. Genital pore just in front of acetabulum. 
7,. (Esophagus present. 
f, Yolk glands extensive and dendritic ; body 
elongate: in amphibians 
Haplometra Lss. (Fig. 57) (44) 
f. Yolk glands small on each side of 
acetabulum ; testes in same transverse 
plane just behind them; ovary to right 
of and just behind acetabulum; body 
broad: in fish 
Callodistomum Odh. (70) 
o,. Pharynx absent; body broad; yolk glands very 
small lobate bodies just behind acetabulum 
Phyllodistomum Brn. (Fig. 63) (8) 
7, (Œsophagus absent; body very broad; testes 4 
large number of small round bodies 
Anaporrhutum Ofen. (Fig. 64) (67) 

