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but in T. plumosa they are more tubular, narrower, and the
orifice points directly upwards rather than outwards. The
dif-ferences in the gonangia are considerable, and are clearly
shown in the figures.
I am now inclined to think that the specimens which I
referred to S. argentea in my report 011 Hydroids of the Willem
Barents Expedition 1881, were wrongly referred to that species:
at least they represent a very distinet variety. The hydrothecee
are more sharply bent and everted, in this respect exaggerating
the features in which S. argentea differs from S. cupressina; and
they were also larger, measuring about 0,43 or 0,44 mm., while
those of British specimens of S. argentea measure only 0,34.
The following measurements give the length of the hydrothecfe
in a series of species of Thuiaria.
Thuiaria (S.) cupressina............................................................................................................0,34 mm.
T. (S.) argentea ....................................................................................................................................0,34 »
T. argentea (var. from Willem Barents collection)............0,44 »
T. robusta..........................................................................................................................................................0,49 »
T. plumosa ......................................................................................................................................................0,49 »
T. turgida............................................................................................................................................................0,so »
T. Vegce..................................................................................................................................................0,52 »
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