B54 C. H. MARTIN. 
fragments of the macronucleus thrown out in connection with 
the formation of a digestive ferment. 
Of these three modes of origin the first is by far the most 
common since conjugating Acinetaria are relatively quite 
rare. But it would still seem necessary to retain the general 
term ‘‘Tinctin-kérper ” since practically these bodies are 
only distinguishable when the details of the past life of the 
individual under examination are known. 
Tokophrya (Bitschli) elongata (Clap. et Lachm.) is a 
more or less cylindrical Acinetan provided with a short stalk 
and with tentacles scattered in rather indefinite groups over 
the surface of the body. 
It is an exceedingly easy form to cultivate, as it feeds 
readily upon almost all Ciliates, and appears to have few 
enemies. 
My cultures were kept in watch-glasses, to the bottoms of 
which the young Acinetarians fixed themselves by their stalks; 
they were generally fed upon Stentor, but when the supply 
of Stentor was short they seemed to thrive equally well on 
Paramecia. 
When the Stentor came in contact with the tentacles of 
the Acinetan, after some short struggles the cilia of the former 
ceased to beat and the animal remained paralysed. 
As the Acinetan was very much smaller than its prey the 
first attack was rarely fatal, but if, as generally happened in 
a healthy culture, a single Stentor was attacked by five or 
six Acinetarians the whole animal would disappear at the end 
of a couple of hours. 
To the details of this process and the mechanism of the 
tentacles I hope to return in a future paper in which I wish 
to describe certain feeding experiments made on Ephelota 
vemmipara. 
Tokophrya elongata reproduces itself by the formation 
of internal hypotrichous ciliated buds, which escape through 
“the birth opening ”—a lateral slit in the pellicule. 
In anormal Tokophrya elongata the macronucleus is 
a band-shaped structure passing down the long axis of the 
