No. 431.] MWORTH-AMERICAN INVERTEBRATES. 907 
g> Suckers not large; testes directly behind one another ; 
body elongate . . Urotocus Lss. (Fig. 99) (44) 
Ja Genital pore not at hinder extremity of body but usually 
near testes. 
gı: Genital pore between testes, which are very large and 
broken up into a large number of distinct parts; no 
pharynx, a long cesophagus, and long intestinal coeca 
present: in sea turtles 
Hapalotrema Lss. (Fig. 100) (44) 
g, Testes not broken into small parts. 
A. Mouth surrounded by circular ridge; intestine 
usually with short lateral projections 
Subfamily XXVII. Clinostominz 
í. Genital pore just in front of testes; pharynx 
absent: in mouth of birds 
Clinostomum Leidy (Fig. 101) (21, 6) 
i, Genital pore a short distance in front of pos- 
terior end; pharynx present: in crocodiles 
Noaha Odh. (71) 
. Mouth not surrounded by ridge 
Subfamily XXIV. Harmostominz 
i,. Genital pore in front of anterior testis. 
j, Body linguiform ; mouth a slit; ovary and 
testes in extreme hinder end : in mammals 
Harmostomum Brn. (Fig. 102) (10) 
Jo Body very elongate and cylindrical; genital 
glands not in extreme hinder end: in 
birds . . .  Scaphistomum Brn. (9) 
Z, Genital pore between the testes. 
j, Body very elongate, tapelike; acetabulum 
very small; oral sucker large; genital 
pore near — end of hinder testis ; 
testes far apart: in Talpa 
Ityogonimus Lie (Fig. 103) (50, 10) 
. Body elongate, linguiform ; genital pore just 
behind anterior testis ; mouth circular: in 
Mycotheria from Brazi 
Glaphyrostomum Brn. (9) 
€». Worms diecious . » . Family III. Schistosomide 
@,. Hinder portion of bódy pida in both sexes; female shorter than 
male: in the blood and liver of birds Bilharziella Lss. (44) 
d,. Body cylindrical in both sexes or expanded in female. 
e, Female longer than male and filiform, and enclosed in the 
gynzcophoric canal of the latter: in the blood of mammals 
Schistosoma Wein. (Fig. 107) (44) 
E 
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