174 
SYDXKY J. HICKSON AND .1. T. WADSWORTH. 
both localities. Sometimes a few specimens may be found 
that are quite free from these epizoites, but it is very rai-el}'' 
the case that a single collection of Dendrosoma is brought 
in that does not show some infected specimens. The number 
varies a good deal, but there is no reason to believe that 
they are more numerous at one season of the year than at 
another. 
The settlement of the gemmiila and the development of 
the lorica have been observed by one of us (W.) on two or 
three occasions. The free-swimming holotrichously ciliated 
geininnla is about 20 by 15 ju in size. The cilia stop moving 
and begin to disappear about ten minutes after settlement 
on the Dendrosoma is effected. The lorica must be formed 
very rapidly as the protoplasm is contracted into an oval 
form near its free end, as in fig. 35, about five minutes after 
the settlement. The cilia ai’e still plainly visible, but in 
another five or ten minutes they disappear. A single tentacle 
begins to grow out a few minutes after the cilia have dis- 
appeared. 
A curious feature that was observed on both occasions was 
the presence of two or three minute capitate tentacles at the 
time the cilia are disappearing-. They are, however, only 
present for a few minutes, and cannot be recognised at all 
when the characteristic Urnula tentacle is developed. 
In the figure given by Saville Kent one of the supposed 
“external buds” is drawn with six short capitate tentacles. 
It is possible that Kent may have observed an Urnula that 
had just settled down and still retained the temporary 
capitate tentacles we have described. 
Further Remarks on the Systematic Position of Dendro- 
soma, Lern.eophrya and Trichophra'a. 
The relation of these three genera has already been briefiy 
referred to in the introduction, but a further summary of the 
characters that distinguish them may be useful in the light 
of the observations we have recorded in this paper. 
