I04 (97) 



PARASITIC FLATWORMS 3^^ 



Testes small, in center of body, separated from ovary by dense 



uterine coils with masses of eggs; no eggs posterior to 



^^ ^Kfidislomum^Vdaord ic)os. 



uuLi, wail tmck. Vitellana continuous from r L'ht to left Ixjth -ilx.v.- mH \J 



Only species known. . Aundistomum chelydrae StaffoTcl rgoo. 

 Intestine of Chelydra serpentina. 



Fig. 687. "^""'i^J^f^^^l^^/^ydrae yitellaria changed to correspond with later account 

 of author. Ventral view. Magnified. (After Stafford.) **ccouni 



105 (68) Testes numerous, in two longitudinal series. 



Pleorchis Railliet 1896. 



Inframedium sized distomes with oval, somewhat flattened bodv Skin 

 spinous Suckers small equal, separated by only one-fourth bodv 'lenrth 

 Oral sucker subterminal. Prepharynx prominent, pharynx small, esophaRu^ 

 extended, crura with single branch directed anteriad. Excretory system 



, Genital pore preacetabular. Cirrus sac absent (?). Testes numerous 

 in two rows near niedian plane in posterior half of body, \-itellaria in two 

 broad lateral bands from acetabulum to posterior end. Other organs con- 

 hned to small area between anterior testes and fork of intestine mostly be- 

 hind acetabulum. Uterus short; ova scanty, 48 ^ long. 



Reported by Leidy from lungs of musk turtle (Aronwchdys odorata 

 Latr.) as Monostoma tnplle. Shown by Stiles and Hassall to be distome 

 somewhat like Distoma polyorchis Stossich. Position and relationship de^ 

 pendent finally on more perfect knowledge of structure which awaits dis- 

 covery of new material. 



Fig. 688. Pleorchis mollis. Magnified, (.\fter Stiles.) 



loO (67) Acetabulum represented by two small suckers set close together in 

 depression on mid-ventral surface near center of bod)-; 

 genital cloaca opens between the two suckers. 



Subfamily Cryptogoniminae Ward. 



Very small, spinous distomes of uniform width throughout, with bluntly rounded ends 

 Oral sucker ver>^ large and prominent. Ventral sucker doul)!e. minute, withdrawn into pocket; 

 gemtal pore between the two. Prepharynx, jiharynx, and short est)phagus present; crura 

 extend to anterior margin of testes. E.xcretory vesicle V-shaix-d, fork at oviduct, anterior 



