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cauline wall is as a rule in different extension firmly connected with 
the stems and branches. A complete diaphragm is as a rule 
developed.  Nematophores are never present. An operculum is 
always present, consisting of 1—4 opercular membranes or valves 
fixed in corresponding sinuations of the margin. [A conical proboscis]. 
Of the characters named in the above diagnosis. I have put 
that which concerns the form of tlie proboscis in parenthesis, as 
I have only been able to verify it myself in rather few forms, the 
proboscis being a structure, the form of which can only be examined 
with advantage in well-preserved material. I am not sure, therefore, 
that it really presents so sharp contrasts that the Campanudariidae 
by the aid of the above named character can be sharply divided 
from the three other related families. According to Allman") 
and Hincks?) we have to discern between two forms of proboscis, 
a "conical”, present in the large majority of the Hydroid families, 
and a "trumpet-shaped” which has only been found in the Euden- 
driidae and the Campanulariidae, While Hincks in the diagnosis 
of the latter family calls the proboscis ”ftrumpet-shaped”, in the 
diagnosis of the genus ''Campanularia” he speaks about a "cup- 
shaped” proboscis, and as these two terms therefore must be 
synonymous, it is evident that Hincks when he uses the expression 
"trumpet-shaped” especially thinks of the expanded end of a 
trumpet. The two latter "terms, however, are very unlucky and 
misleading, as every proboscis in its expanded state is ""cup-shaped” 
or "trumpet-shaped”, while at the other side the proboscis of Eu- 
dendrium, Campanularia and Laomedea is ”club-shaped” or bulbi- 
form, not only according to my own examination of well-preserved 
material,, but also- according to figures given by Allman and 
Hincks. In well-preserved specimens of Sertularella tricuspidata 
and Halecium muricatum, lately brought home from Greenland, I 
have found that tbe expanded proboscis is "”cup-shaped” while it 
is conical in its contracted state, and when Hartlaub?) in his 
work on Sertularella says about the proboscis of this genus: "Die 
Vik 8 NNE 
