: 1884] Notes on a New Infusorian. 661 
Sating vacuole, sub-terminally located below and to the right of 
_ the median line, contracts at intervals of six seconds, 
_ The infusorian has the inexplicable habit of protruding sub- 
terminally on the left dorso-lateral margin, a colorless, semi- 
transparent hemisphere of the body sarcode, in which there is 
often a circulation of the minutely granulate protoplasm. The 
_ object of this bubble-like protrusion, as intimated, I have been 
unable to determine. It was at first mistaken for the beginning 
_ of a temporary anal aperture, but such use of it has not been ob- 
served. It is frequently withdrawn, leaving a lighter smooth 
Spot in its place. 
But it is on the ventral surface that we find most of the crea- 
ture’s peculiarities. Originating at the anterior margin and ex- 
\\ 
Fig. 1. Fig. 2. 
: 2 rhe maga acanthocrypia, gen. et sp. nov. Dorsal aspect. X 700. Fis. 
tending almost centrally across the ventral surface, but somewhat 
Sbliquely backward and inward, for a distance equal to three- 
fourths of the animal’s entire length, is a shallow, narrowly ovate 
frove, at whose posterior and widest and deepest part the oral 
aperture is placed. This depression, narrowest at its anterior 
a and gradually and regularly widening to its rounded poste- 
oe i leng th I he 
peculiar glimmering appearance which they pro- 
