DENDROSOMA RADIANS, EHRENBERG. 
169 
short suckei’s were produced, scattered irregularly but 
principally near the margin of the body. The body of this 
specimen did not retain its circular form, but became irregu- 
larly quadrilateral. After a period of two hours (fig. 4) the 
cilia had disappeared and the suckers were mainly collected 
at the two ends, but two or three odd suckers were observed 
in the middle. In another hour there were three distinct tufts 
of suckers (fig. 5), but two hours later still all the suckers 
had disappeared except one isolated one, and a dense tuft at 
one end (fig. 6). The next morning’, i.e. eighteen hours 
later, the end supporting the tuft of suckers had grown 
considerably to form a definite Dendrosoma arm (fig. 7). 
The stage just described corresponds vvith that figured by 
Savile Kent (in his Pi. 47, fig. 21), but differs from it in the 
absence of suckers on the general surface of the body. We 
have seen a good many specimens of this stage but never one 
which, possessing a well-defined arm, had suckers scattered 
over the rest of the body, as shown in KenPs figure. In 
Kent’s figure of this stage only three contractile vacuoles 
are shown. Levick, however, gave another figure in which 
six contractile vacuoles were shown. The latter is in this 
respect, as well as in the actual size, more in accordance 
with our observations than the former. 
'r h e s o - c a 1 1 e d “ e X t e r n a 1 buds .” — In the literature of 
Dendrosoma reference is made by nearly all authors to 
another method of reproduction than that by the gemmulge 
previously described. Kent observed at or near the distal 
extremity of the arms of many specimens a number of 
spherical or oval bodies, which he believed to be “ exo- 
genously produced germs similar to those of Acineta 
mystacina of Stein.” It is probable that these are the 
same bodies as those previously described by Levick as 
“ovaries.” Biitschli describes them as “ angebliche freie 
iiussere Knospen,” and Sand as “ gemmes externes ciliees 
quelqiiefois tentaculees, produites a I’extremite des rameaux.” 
We have found bodies similar in position, form, and size to 
these so-called external buds in our specimens from the 
