272 C, H. MARTIN. 
‘Zoologischer Anzeiger,’ in 1889, Bohmig describes an un- 
doubted Rhabdoccel which he found at Trieste, and which he 
identifies with Microstoma papillosum. The size of the 
chains measures 500 to 1100. There were no eyes, but 
adhesive papille were present. Nematocysts which he does 
not figure, were found. From the form of the animal, the 
appearance of the rhabdites, and the presence of the papille, 
one would feel that it must resemble extremely closely 
Stenostoma sieboldii. 
Stenostoma sieboldii.—Von Graff figures a specimen 
in which there were present— 
(1) Bundles of large rhabdites, 
(2) Small oval nematocysts. 
It is interesting to observe that the nematocysts lie to the 
number of 2—5 in common vacuoles under the skin (and 
apparently in the gut). In the forms which I examined I 
could not find the small nematocysts, but I was able, by 
feeding Stenostoma on chopped Eudendrium, to get speci- 
mens in which unexploded nematocysts lay in the gut and 
under the skin. 
KALYPTORHYNCA. 
Von Graff, in his Monograph of the Turbellaria, remarks : 
“Tn die Kategorie der Nematocysten gehoren schliesslich die 
am Riissel gewisser Probosciden die Stelle der Rhabdites — 
vertretenden Gebilde.” He then states that the epithe- 
lium of the proboscis in Polycystis mamertinus and 
negellei contains almost identical “ eiformige gebilde,’’ 
which he considers to be nematocysts, and which he believes 
show their homology with true rhabdites through the presence 
of intermediate forms. 
Von Graff was unable to detect the expulsion of a thread 
in these structures, and I believe that they can only be 
regarded as rhabdites resembling those on the rest of the 
body. In sections stained with methyl-blue-eosin these 
structures on the proboscis and the rhabdites of the skin take 
up a similar bright red colour (figs. 13 and 14). 
