352 CG. H. MARTIN. 
it better to place the results I had obtained on one side until 
the occurrence of a more favourable opportunity. 
During the early summer of 1907, whilst working in Norfolk, 
I found an Acinetarian which corresponded with Keppen’s 
Acineta papillifera, in great abundance on the stems of 
Cordylophora lacustris in Hickling Broad. During the 
early part of September an epidemic of conjugation set in, 
and although, owing to the pressure of other duties, I was 
not able to follow the stages in the living form as completely 
as I should have wished, I was able to obtain enough fixed 
material to work through the main nuclear changes in this 
process. In the second part of this paper the life-history of 
a new Acinetarian parasite Tachyblaston ephelotensis 
is described, and in a future paper I hope to deal more fully 
with some general questions as regards the mechanism of the 
tentacles, as well as the relations between the lageniform 
and proboscidiform individual in that remarkable animal 
Ophryodendron. 
I should like to take this opportunity of thanking Professor 
Hertwig, to whom the inception of this work is entirely due, 
for the great kindness he showed me at Munich, and Professor 
Graham Kerr for allowing me to work through my material 
in the laboratory at Glasgow University. 
Il. Tae “Trincrrn-KOrPER”? OF ACINETARIA WITH SOME OBSER- 
VATIONS UpoN THE NucLEAR CHANGES OF 'OKOPHRYA 
ELONGATA. 
Before proceeding to give an account of the conjugation of 
Acineta papillifera, it will be necessary to give some 
account of those isolated masses of chromatin, the ‘ ‘l'inctin- 
kérper” of Plate, which may occur in all free-living Acine- 
tarians, and which enormously increase the difficulties of 
work upon the nuclear changes during conjugation. 
Plate in 1886 first drew attention to certain rounded bodies 
occurring in the cytoplasm of Dendrocometes which were 
