440 MR. A. LISTER ON THE INGESTION OF FOOD-MATERTAL 
x 1200 
Fig. 1. Swarm-cell of Stemonitis fusca of the usual form when swimming. %, 
nucleus ; v, vacuoles. 
Fig. 2. Swarm-cell with three bacilli adhering to expanded posterior extremity. 
Fig. 3. A swarm-cell with delicate pseudopodia, to one of which a bacillus is 
attached. . 
Fig.4. The same swarm-cell, the bacillus in the act of being drawn in, and 
partly invested with a tube-like extension of the body-substance. 
Fig. 5. The same bacillus, contained in a long vacuole, and bulging out the sides 
of the swarm-cell. 
Fig. 6. The same bacillus, bent double after violent jerking movement of the 
swarm-cell. 
difforme. Mere, as in other species, the spores of different 
gatherings are uncertain in the time they take to hatch, but the 
swarm-cells usually appear in about twelve hours after placing 
the spores in water. They are protean in their forms, chaug- : 
ing from the ciliated and elongated shape to stellate amoebe, | 
