DEXDROSOMA RADIANS, EHRENBERG, 
143 
freie aiissere Knospen ” ; Lankester (21), in his description of 
the figure, refers to them as “more minute reproductive (?) 
bodies.” 
Tliere can be no doubt, however, that these bodies are not 
“ buds ” at all, but epizoic Acinetaria belonging to the 
genus U r n ula. 
The megauucleus was described by Kent as follows : “Endo- 
plast ribbon-like, ramifying and much contorted in the 
stolon and basal portions of the main stem, continued as a 
simple band into the distal region and secondary branchlets.” 
He gives a figure of the meganucleus in a small portion of 
the basal part of an arm, which is probably correct so far as 
it goes, but in the figure of a distal portion of an arm the 
nucleus is shown to extend much nearer to the extremity 
than we have found it in any of our preparations. In the 
figure of the whole specimen the ineganucleus is not shown 
at all. This figure has been copied by the writers of many 
text-book.s, and in some, as, for example, those of Calkins 
(3) and Lang (20), the meganucleus has been added to the 
figure and erroneously shown to extend to the extremity of 
all the branches. 
The other genera of Acinetaria that are apparently closely 
related to Dendrosoraa are Trichophrya (C. and L.), Ler- 
lueophrya (Perez), Astrophrya (Awerinzew), and Den- 
drosomides (Collin). Concerning Astrophrya we have 
at present only a short note and figure by Awerinzew (1). 
The single specimen obtained was found free in the plankton 
of the Volga, and, like some of our specimens of Deudrosoma, 
it had a massive test of adherent sand grains and plant 
detritus. As it is figured with long arms and rather short 
tentacles its affinities are apparently with Dendrosoma rather 
than with Lernmophrya. 
The genus Trichophrya seems also to be closely allied to 
Deudrosoma. It is found on the stalk of Epistylis and on 
the appendages of Astacus and various Entomostraca. We 
have found specimens which we attribute to the genus 
Trichophrya in our material obtained from the Bridge- 
