No. 432.] MORTH-AMERICAN INVERTEBRATES. 955 
GENUS OPISTHORCHIS 
4,. Body not spinose, lanceolate; testes not at extreme hinder end of 
body; ro-21 mm. long, 1-2.5 mm. wide: in the liver of cats and 
the cayote . . . O. pseudofelineus Ward (Fig. 30) (94, 81, 93) 
4,. Body spinose, very elongate; testes at extreme hinder end of body; 
12-29 mm. long, I mm. wide: in liver of crow 
O. spestosus S. et H. (81, 84) 
GENUS METORCHIS. 
Uterus massed around acetabulum ; body linguiform ; testes large and 
lobate; 6 mm. long, 2 mm. wide : in cats 
M. complexus S. et H. (Fig. 32) (81) 
GENUS TELORCHIS. 
Yolk glands extend in front of acetabulum; intestinal ceca extend 
beyond testes; 3.15 mm. long: in intestine of painted turtle 
T. angustus Stafford (79) 
GENUS DEROPRISTIS. 
Anterior end usually attenuated and covered by large, coarse spines, 
remainder of body by short spines; acetabulum much larger than oral 
suckers; 3-6 mm. long, 1.2 mm. wide : in the intestine of Phycis tenuis 
D. hispidus Abil. (40, 70) 
GENUS ECHINOSTOMA. 
a,. Number of oral spines "r 37; 18 mm. long, 1.5 mm. wide : in 
intestine of muskrat  . E. echinatum Zed. (Fig. 25) (28) 
. Number of oral spines 45; 2. xà mm. E in intestine of GZde»ia 
americana E. flexum Linton (36) 
a,. Number of oral rien ve body elliptical; 8. mm. long: in intestine of 
Botaurus minor. . . E. aspersum R. Wr. (97) 
GENUS STEPHANOCHASMUS. 
Number of oral spines 32, 16 being in each row ; body cylindrical 
34. 
anteriorly, globose posteriorly ; 2.5-3 mm. long : in capsules in peri- 
toneum of filefish (A/utera dit et al. 
S. valdeniflatus Stoss. i m 
a, Number of oral spines 42, 21 being in each row ; body sl 
lanceolate ; pharynx very large ; prepharynx long; intestinal cceca 
bowe 3 mm. long, 0.6 mm. wide : in rectum of striped bass (occus 
. S. tenuis Linton (38, 40) 
afus) . 
az. "eam elongate ; heri dps pre ohair long ; 3-15-4.5 mm. long, 
0.5 mm. wide: in peritoneum of odi giam (Morone americana) 
enuis tenuissimus Linton (38) 
