No. 2322. TREMATODE FAMILY HETEROPHTIDAE— RANSOM. 555 



sometimes bent upon itself with one lobe dorsal, the other ventral, and 

 situated on the right side of the median line in front of and ventral 

 of the seminal receptacle. Vitellaria extend across body in front of 

 genital pore, on the dorsal side of the branches of the intestine, and 

 often meet in the median line. Anterior limits of the vitellaria in 

 the region of the bifurcation of the intestine ; posteriorly they extend 

 behind the testes, but do not cross the median line. Transverse vitel- 

 line ducts located in the neighborhood of the boundary between the 

 ovarian and testicular zones. Uterus disposed in a few loops in the 

 median field ; none in front of the genital pore. 



Type species, — C otylophallus venustus Ransom, 1920. 



KEY TO SPECIES. 



Vitellaria with numerous lobules extending entirely across 



body in region between genital pore and bifurcation of 



intestine, elsewhere lobules disposed mostly in a single 



row right and left along the outer sides of the intestinal 



ceca C otylophallus similis. 



Lobules of vitellaria relatively not numerous in region in 



front of the genital pore, very scarce towards the 



median line, elsewhere disposed in several rows along 



the outer sides of the intestinal ceca and lapping over 



the latter dorsally and ventrally in the posterior half of 



the body C otylophallus venustus. 



COTYLOPHALLUS VENUSTUS, new species. 



Figs. 22-25. 



1920. Cotylophallus venustus Ransom, 1920 (the present paper), (type of 

 C otylophallus ; in Vulpes lagopus ; dog; cat; U. S.). 



Specific diagnosis.— Cotylophallus: Length up to 1.3 mm.; maxi- 

 mum width, 0.23 to 0.65 mm., the length in expanded specimens being 

 from twice to about three times the maximum width. Cutaneous 

 scales about 5 ^. long by 1.5 to 3.5 [x wide. Oral sucker, 40 to 90 ^ in 

 diameter. Pharynx, 30 to 70 [j. in diameter. Bifurcation of intestine 

 one-fifth to a little over one-third the body length from the anterior 

 end; intestinal ceca extend into posterior fourth of body. Ven- 

 tral sucker, 36 to 100 ^ in diameter ; 120 to 600 [/., or one-third to one- 

 half the body length from the anterior end. Testes in posterior 

 third of body, oval or globular; major diameter, 75 to 320 [x. Ovary, 

 70 to 180 [JL in its major diameter, situated 200 to 800 [x (from about 

 one-half to two-thirds the body length) from the anterior end of 

 body. Vitellaria with comparatively few lobules in front of the 

 level of the anterior border of the ventral sucker, very scarce in the 

 median line ; behind the level of the ventral sucker, being arranged in 

 several rows along the outer sides of the intestinal ceca and testes, 

 frequently overlapping the intestinal ceca ; commonly a considerable 



