ART. 12 



NEW SPECIES OF TREMATODES FIIICE 



This species apparently occupies a position intermediate between 

 ParcmetorcMs coiii'plexus^ which was described by Stiles and Hassall 

 (1894), from the gall bladder of cats from New York, Marjdand, and 

 District of Columbia, and P. novehoracensis which was described by 

 Hung (1926) from the gall bladder of a cat from New York. In the 

 former species the testes are deeply lobed and the vitellaria unite in 

 the median line forming a U around tlie uterus ; in the latter species 

 the testes are almost round, the posterior being only slightly in- 

 dented, and the vitellaria do not unite in front of the uterus. The 

 peculiar character of the vitellaria in P. compleocus appears to be 

 constant and not changed by host relationship. Specimens of this 

 species which the writer has examined (U. S. N. M No. 14407), col- 

 lected January 21, 1907, by E. C. Stevenson from a blue fox which 

 died in the National Zoological Park, Washington, D. C, conform in 

 this respect to the type specimens from the cat. P. intermedius is 

 considerably smaller than either P. comjylexus or P. novebaracensis. 



/mm. 



Figure 2. — Parametorchis canadensis, new species. Dorsal view 



The body form and shape of the testes are similar to the former 

 species, but the arrangement of the vitellaria is similar to that in tlie 

 latter species. On the basis of these differences, the writer feels 

 justified in considering P. intermeAms a distinct species. 



PARAMETORCHIS CANADENSIS, new species 



Specific diagnosis. — Pammet orchis: Body linguiform, transparent, 

 1.7 to 2 mm. long 590yu, to 687/x wide in the region of the anterior testis. 

 Cuticle missing owing to the somewhat macerated condition of the 

 specimens. Oral sucker terminal, 93/x to 108/a long by 140w to 155w 

 wide. Prepharynx absent ; pharynx muscular, 108,a to 140/1, long by 

 62/t to 93/A wide. Esophagus very short; intestinal ceca slightly sinu- 

 ous, terminating 70/x to 90/a from the posterior end of the body. Ace- 

 tabulum 125ju, long by 140/* wide, weakly muscular, and situated about 

 470/A from the anterior end. Testes oval or slightly indented, and 

 situated tandem in the posterior half of body; they are about equal 



