PARASITIC FLATWORMS 



383 



region. Genital pore median, not far from oral sucker. Cirrus sac elongate enclosing only part 

 of the convoluted seminal vesicle. Testes symmetrical, near posterior end, outside intestinal 

 crura. Ovary between te.stes. V'itellaria lateral, anterior to testes. Uterine coils behind 

 cirrus sac, transverse, regular, not extending outside intestinal crura. Eggs with long fila- 

 ments at both poles. 



42 (43) With conspicuous longitudinal rows of papillae on ventral surface. 

 Metraterm barely half as long as cirrus sac. 



Notocotylus Diesing 1839. 



Body attenuated in front, broadly rounded behind. V^entral surface 

 with three rows (in A'^. quinquesenalis with five rows) of glandular 

 masses which open into protrusible grooves. 



European species reported from cecum of water birds. 



Representative American species. 



Notocotylus quinqueserialis Barker and Laughlin igii. 



In North America one species; in the cecum of the muskrat. 

 Nebraska, Michigan. 



Fig. 665. Notocotylus quinqueserialis. Ventral view. Magnified. (After 

 Barker and Laughlin.) 



43 (42) \>ntral rows of papillae poorly developed. Metraterm about equal 



in length to cirrus sac Catatropis Odhner 1905. 



Body tapering only slightly, about equally rounded at both ends. \'en- 

 tral surface with three rows of poorly developed gland masses; the middle 

 row opens on a low keel or ridge; the lateral rows contain each eight to 

 twelve small wart-like, non-retractile prominences. Metraterm well de- 

 veloped, as long as cirrus sac. 



European species in cecum and rectum of water birds. 



Representative American species. 



Catatropis filamentis Barker 191 5. 

 Only North American species; in the duodenum of the muskrat. 



Fig. 666. Catatropis filamentis. \'cntral view. Magnified, (.\fter Barker.) 



Nudocolylc novicia, very recently described by Barker from the muskrat, is 

 placed in this family despite some striking mori)hological dilTerences. The 

 form is small (0.7 to 0.9 mm. long by 0.5 to 0.65 mm. wide), thick-bodied, 

 and without ventral glands. The genital pore is lateral and well behind the 

 middle of the body, being thus far removed from the intestinal bifurcation. 

 The heavy pyriform cirrus pouch encloses part of the convolutnl seminal 

 vesicle. Vitellaria in compact masses lie e.xtracecal and just behind the 

 middle of the body. Transverse uterine coils extend over the intestinal 

 crura nearly to the lateral margins of the body; they fill the anterior half 

 and are limited posteriorly by the cirrus pouch and vitelJaria. The eggs 

 measure 20 to 24^ by 10 to 13/i and have long heavy polar filaments. 



Parasitic in intestine of muskrat; Minnesota. 



44 (39) Body compressed, broader than long. Parasitic in pairs in dermal 



cysts Family Collyriclidae Ward. 



Small to moderate sized monostomes with thick but not muscular body, smooth skin; oral 

 sucker and phaiynx present; ceca long, capacious, not united. C.enital pore ventral near 

 center of body; vitellaria follicular, scanty, antero lateral. Ovary much lobed. asymmetrical. 

 Testes oval, symmetrical behind ovary. Uterus in irregular coils showing a tendency to antero- 

 posterior direction. Terminal region of uterus enlarged. 



Parasitic in dermal cysts on abdominal surface. Usually two in each cyst. In birds. 



Only American genus 0>//ynV/Mm Kossack loi i. 



Submoderate sized trematodes with dorsally arched and ventrally flattened Ixxly. Oral 

 sucker weak, pharynx small, intestinal crura simple, very broad. Oenital ixjre median, just 



