STUDIES ON EUGLENAMORPHA HEGNERI N. G., N. SP., A EUGLENOID FLAGELLATE FOUND IN TADPOLES

1. Euglenamorpha hegneri is the name proposed for a new Euglena-like flagellate found in the rectum of tadpoles and first reported by Hegner ('22).2. Most of the tadpoles examined were those of the bullfrog obtained from the pond in the Botanical Gardens of the University of Pennsylvania. Some tadpoles of Rana palustris collected by Dr. C. L. Parmenter and fed on vegetation from the same pond were also examined. About 60 per cent. of the 117 bullfrog tadpoles examined in 1922 and 16 per cent. of the 30 examined in 1923 harbored Euglenamorpha. About 60 per cent. of the 9 tadpoles of Rana palustris examined in 1922 and also of the 35 examined in 1923 were infested with this flagellate. Eight tadpoles of R. clamitans(?) and 8 of Hyla versicolor(?) examined at Woods Hole in August, 1923, all contained Euglenamorpha.3. There are two varieties: one, green, is the type, and the other, pellucida, is a colorless derivative. Typical individuals of the two varieties are so different that without intermediate stages ...