TWO NEW INTESTINAL TREMATODES FROM THE DOG 



IN CHINA. 



By Makcos a. Tubangui, 



0( Los Bat'ios, Philippine lulamU. 



Among some trematodes in the Helminthological Collections of 

 the United States National Museum collected in China by Dr. R. T. 

 Shields are two forms, one of which represents a species of Proheinis- 

 tomum hitherto undesci'ibed, and the other a variety of Echinochas- 

 raus perfoliatus differing somewhat from the European specimens 

 of this species as described by various writers. Through the courtesy 

 of the Bureau of Animal Industry, United States Department of 

 Agriculture. I have had the opportunity of making a study of these 

 specimens, and I am indebted to Dr. B. H. Ransom for his friendly 

 interest as well as for the privilege of utilizing the facilities of the 

 laboratory of the Zoological Division in my studies. 



ECHINOCHASMUS PERFOLIATUS SHIELDSI, new variety. 



Plate 1. 



The genus Echinoehasmus was proposed by Dietz (1909) in order 

 to separate from the old genus Echinostoma Rudolphi, 1809, a group 

 of trematodes characterized principally by the presence of a single, 

 dorsally-interrupted row of spines arranged around a kidney- 

 shaj^ed collar, a small cirrus sac which lies anterior to the center of 

 the acetabulum, and vitellaria which extend from the level of the 

 acetabulum to the posterior extremity of the body. In 1911, Odhner 

 raised it to the rank of a subfamily (Echinochasminae), and of its 

 representatives only one, E chinochasvius perfoliatus^ has thus far 

 been known to infest the dog. It was first recorded by von Ratz 

 (1908), but only a short time afterwards it was again reported by 

 Railliet and Henry (1909) under the name Echinostoma gregale. 

 Since then several authors have found it in Europe in the dog, cat, 

 and hog, and, according to Railliet and Henry (1909), the Distoma 

 echinatuvi reported by Generali (1881) might have been the same 

 species.^ 



1 Dr. W. W. Cort, in a note on January 29, 1921, before the Helminthological Society of 

 Washington, reported an experiment in whicli Tanabe, as a result of swallowing trematode 

 cysts found in a fish, afterwards recovered from his feces mature flukes that he designated 

 by the name Echinostomum perfoliattim japonicum. At the same meeting I called atten- 

 tion to the presence of Echinoehasmus perfoliatus In China, based upon the specimens 

 described In the present paper. I have also been advised by Dr. R. T. Leiper that he has 

 found Echinoehasmus perfoliatus to be very common in dogs in Shanghai. 



No. 2416— Proceedings U. S. National Museum, Vol. 60. Art. 20. 



1 



