PARASITIC FLATWORMS 



403 



130 (139) Receptaculum seminis present (except Plagiorchis); crura reach 



posterior end (except Styphlodora) 131 



131 (138) Vesicula seminalis fills greater part of cirrus sac; pars prostatica 



follows after it and is very short. 



Subfamily Plagiorchiinae Liihe 1909. . . 132 



132 (13s) Genital pore near oral sucker 133 



133 (134) Testes median or nearly so Pneumonoeces Looss 1902. 



Medium sized distomes, with body elongate, thick, and only slightly flattened, tapering an- 

 teriorly. Acetabulum small. Oral sucker large, pharynx well developed, esophagus short, in- 

 testinal crura long, extending to posterior end. Genital pore just behind oral sucker, median, 

 ventral. Cirrus sac greatly elongate, reaching acetabulum. Ovary near acetabulum. Testes 

 postovarian, sUghtly oblique. Large seminal receptacle between testes and ovary. No Laurer's 

 canal. Vitellaria lateral in middle region of body. Uterus much coiled, extending to extreme 

 posterior end. Eggs numerous, small, dark shelled. 



In lungs of Anura; widely distributed and abundant. Develop perhaps from Xiphidiocer- 

 cariae. North American species well worked out and described with key by Cort. 



Representative American species. 



Pneumonoeces coloradensis Cort 1915. 



Fig. 699. Pneumonoeces coloradensis. FuUy developed specimen, ventral view, 

 receptacle. X 27. (After Cort.) 



0, ovary; sr, 



seminal 



134 (133) Testes lateral and symmetrical or nearly so. PneumoUtes Ward. 



Much like Pneumonoeces but body larger, thicker, with testes lobed, elongate, lateral and 

 symmetrical or only shghtly oblique. Extracecal longitudinal folds of uterus pronouncedly 

 longer than in Pneumonoeces. Ovary lobed. Vitellaria with many very small acini in each 

 group. Eggs small. 



In lungs of Anura. Two species in North America: P. longiplexus, P. breiiplexus. Cort, 

 who grouped these in Pneumonoeces, called attention to their close relationship. The points 

 of resemblance constitute also characteristic differences from other species in Pneumonoeces 

 sufficient to justify their being made an independent genus. 



Type species. 



Pneumobites longiplexus (Stafford) 1902. 



Fig. 700. Pneumobites longiplexus. Dorsal view, o, ovary; sr, seminal receptacle. X 13. 



(After Cort.) 



