DEXDROSOMA RADIANS, EHRENBERG. 
151 
putrid owing to the death of the Cordylophora and the decay 
of the roots to which it is attached, and we have not succeeded 
so far in getting the specimens to become fixed to any other 
support. 
The Sti:ucture of Denurosoma. 
We have very little to add to the knowledge of the suckers 
and the general cytoplasm of Dendrosoma. The suckers are 
of considerable lengdh, terminating in a small knob or cup. 
They are usually quite rigid when extended, like the suckers 
of most of the other Acinetaria, and they can be slowly 
shortened when circumstances become unfavourable. Being* 
very slender and transparent we have not been able to 
demonstrate tlie pi’esence of a definite lumen, nor have we 
seen even in the shortest suckers any evidence of a spiral 
ridge such as can be seen on the retracted suckers of some other 
Acinetaria (fig. 45). In several of our series of sections we 
have been able to trace very delicate lines i-uuning down 
some distance into the arm from the bases of the suckers. 
The cytoplasm is usually clear and transparent. In the 
living arm a streaming movement of minute granules can be 
clearly seen, as originally described by Levick. In well- 
stained preparations the cytoplasm appears to consist of a 
delicate network of fibrils enclosing a number of minute 
granules which stain faintly with acid dyes, but there are 
veiy few elements in the cytoplasm that give a deep stain with 
basic dyes. We have found no evidence in our prepai ations 
of bodies corresponding to the ‘‘Tinctinkorper” of other 
Acinetaria in the arms or stolon where the meganucleus is 
clearly delimited. In some cases, however, when the mega- 
nucleus is scattered (see p. 15G) the cytoplasm is filled with 
numerous chromatin bodies which may be derived from the 
meganucleus. 
IMartin (24) suggests in a recent paper that the “ Tinctin- 
kdrper ” of other Acinetaria represent in some cases the 
chromatin of the nucleus of ingested prey. The difficulty we 
