
966 THE AMERICAN NATURALIST.  [Vor. XXXVI. 
SUBFAMILY PRONOCEPHALIN4E. 
Body elongate, lateral margins parallel; reniform projection at anterior 
‘end ; intestinal cceca long and serpentine ; testes lobate at hinder end; 18- 
25 mm. long, 3 mm. wide: in intestine of Spargus coriacea 
Monostomum renicapite Leidy (21, 8) 
GENUS OPISTHOTREMA. 
Body broad, sagittate; testes small, lobate, in same transverse plane, 
laterad of intestinal coeca; ovary small, in front of testes; 10 mm. long; in 
Manatus YO aare Leuck. (Fig. 118) (96) 
GENUS CYCLOC@LUM. 
Body elongate, attenuate gsm ; 18 mm. long: in thoracic cavity of 
Gallinago eż a7. oo . . . C. mutabile Zed. (Fig. 119) (26, 80) 
GENUS NOTOCOTYLUS. 
Body elongate, elliptical ; testes in hinder end of body; 7 mm. long: in 
intestine of Somateria mollissima et al. 
N. verrucosus Fróh. (Fig. 124) (33) 
MonosToMIDS OF UNCERTAIN LOCATION IN THE SYSTEM. 
Body spatulate, broader posteriorly; oral sucker small ; intestinal coeca 
long; 12 mm. long, 2 mm. wide: in bile ducts of muskrat 
Monostomum affine Leidy (23) 
Body elongate, elliptical, obtusely angular in front, obtusely rounded 
behind; 12 mm ig 2 mm. wide: in stomach of jewfish (Megalops 
thrissotdes) . . . . . Monostomum obscurum Leidy (27) 
Body flat, oblong ovate, narrowing anteriorly, obtuse posteriorly ; 6 mm. 
long, 1 mm. wide: in fresh-water fish 
Monostomum spatulatum Leidy (23) 
Body ovoidal, loger broad; 2 mm. long, 1 mm. wide: in body cavity 
of Rana pipiens, . . . Monostomum ornatum Leidy (21) 
Body elongate, posterior quac slightly broader ; cesophagus very long ; 
intestinal cceca short; genital pore at end of esophagus in hinder half of 
body ; 1.4 mm. long, .24 mm. wide : encapsuled under skin of Séven lacertina 
Monostomum aspersum Vail. (80) 
. Body ovate, spiny; 8 testes, 4 on each side; ovary lobate in front of 
them; uterus voluminous; 2.3 mm. long: in Opsanus tau 
Monostomum vinal-edwardsii Linton (40) 
: Body Maius: ; hinder end truncated or concave; testes side by side, at 
e MEM. hinder end; ovary lobate, near center of body; 5 mm. long: in 
i ng bladder of catfish ‘onostomum amiuri Safford (79) 
