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D. H. WENRICH. 



material was taken and tadpoles were examined when available. 

 As reported by Hegner ('22), tadpoles were found to be abun- 

 dantly infested with intestinal protozoa and the relation of these to 

 the intestinal forms of -the adult Amphibia presented itself as an 

 interesting problem. A small pond in the botanical gardens of the 

 University of Pennsylvania harbors a goodly number of bullfrogs 

 and their tadpoles which offered convenient material for the study 

 of this problem, and it was in the intestinal contents from these 

 tadpoles that Euylcnauwrpha was first recognized in June, 1922. 

 Of the 117 bullfrog tadpoles examined during the period from 

 May 31, 1922, to January 19, 1923, 68, or 58 per cent., were found 

 to contain Euglenamorpha. Most of these tadpoles were obtained 

 from the pond mentioned above. Tadpoles of Rana paliistris col- 

 lected by Dr. C. L. Parmenter and fed on vegetation from the 

 same pond were also infested by this flagellate. I am much in- 

 debted to Dr. Parmenter for permission to examine his tadpoles. 



During the summer of 1923, 35 tadpoles of R. palustris from 

 some collected and reared by Dr. Parmenter were examined and 

 21 or 60 per cent, contained Euglenamorpha, while of 30 bullfrog 

 tadpoles from the pond only 5, or 16% per cent., revealed this 

 flagellate. On the other hand, of 8 tadpoles of R. clamitans(J) 

 and 8 of Hyla versicolor examined at Woods Hole, Mass., every 

 one contained Euglenamorpha. 



The colorless variety (described beyond) was frequently found 

 in the bullfrog tadpoles during the summer of 1922, but has not 

 been found in any of the tadpoles of R. palustris nor in the tad- 

 poles of any of the species examined in 1923. 



An examination of slides made from the rectal contents of bull- 

 frog tadpoles collected from the pond in September, 1919, revealed 

 the presence of Euglenamorpha at that time, and it is probable that 

 it has existed there for an indefinite period. 



This new flagellate is usually found in the rectum of the host 

 and is commonly more numerous in the middle and posterior re- 

 gions of that organ than in the anterior portion, which is favored 

 by most of the other entozoic species. Hegner ('23) found it in 

 the small intestine as well as the rectum in a number of cases and 

 active individuals have also been seen in freshly deposited faeces. 



The entozoic character of Euglenamorpha was established in a 



