SPIROCHATA BALBIANII AND SPIROCHETA ANODONTA. 19 
spirally bores its way more or less vertically upwards. In 
this condition it twists itself into various peculiar shapes, 
and so resembles a Catherine wheel as described by Perrin 
(text-fig. 4). 
Parasites are sometimes noticed anchored by one end to 
débris, such as a detached epithelial cell of the gut of the 
host, now lying free in the gut contents (Pl. 2, fig. 28). 
The free end of the parasite then executes violent lashing 
movements or intermittent flickers, not unlike those of a 
& 
TExt-Fric. 2.—The free end of an anchored parasite or of a very 
slowly moving form may curl over. a, 6. S. balbianil. e, d. 
anodonte. 
“flame cell.” The free end also in such specimens may coil 
itself over and over (text-fig. 2; also Pl. 1, fig. 1; Pl. 2, fig. 
12; Pl. 3, fig. 21). S. balbianii, with its rounded ends, 
often has some difficulty, apparently, in boring its way through 
débris or obstacles in its path. It often tries to get through 
these instead of changing its direction of motion. However, 
I have seen it penetrate free epithelial cells and occasionally 
appear to come out of such cells. S. anodonts, with its 
pointed ends, succeeds rather better on such occasions, and 
more easily bores its way through or among the débris of 
cells and diatoms floating freely in the gut-contents of the 
host. 
