50 
Transactions of the Royal Microscopical Society. 
rather long cilia, which lie nearly horizontally when the animal is 
fully expanded. Inside these are four much more robust cilia, 
which are once divided, like a hay-fork. These stand more upright ; 
two are situated just above the operculum, and two on the other 
side of the peristome. Both these sets of cilia twitch spasmodi- 
cally at uncertain intervals, but have no uniform motion. Lying 
internally to these are a set of very short cilia, which are con- 
stantly active both when the animal is protruded and when it is 
withdrawn into its sheath. 
In the young the lorica is nearly transparent ; and there is no 
operculum until the lorica is fully shaped out. It then commences 
to grow, but does not get the full size of the aperture until the 
lorica has become quite dark coloured. I have never seen two in a 
lorica. 
I propose to call this species Cothurnia furcifer, from its four 
fork-like cilia. The likeness of this infusorian to the capsule of a 
moss is remarkable. 
