Sn 
On the uppermost part of the stalk there is a basin-shaped 
dise in consequence of the upwards curved rays; it has about 
26—28 rays which are united in the living plant but immediately 
separate after decalcification with acid. According to Solms the 
plant ought to have: ‘Rays even in the living state separate and 
free”. This however was not the case with my specimens and this 
is the most essential difference between my specimens and the 
description of Solms. Yet I do not think this is so very impor- 
tant. One of the 
above-named spe- 
cimens from Fre- 
mantle in the British 
Museum and con- 
served in spirit, re- 
ally had a few se- 
parate rays but most 
of them were con- 
nected and when 
seen under micro- 
scope a calcified 
mass was also Vi- 
sible on the few 
separate rays with Fig.6. Acetabularia Caliculus Quoi et Gaimard. 
which they most = ru ih ea te Rito 
probably have all Fig. A about 10:1, B and C about 60:1. 
been pasted toge- 
ther. In the original figure also by Quoi and Gaimard they 
are connected and Harvey writes l.c. tab. 249: “The coherence 
between the cells also appears to be less strong than in other 
species”, but that they might be free he does not say. In this 
eonnection I may also point out that Howe in Acetabularia 
Farlowii, which according to Solms has separate rays, by exami- 
nation of the plant in living state has found that “only about one 
in four or one in five” of a thousand speeimens has got it. 
The apices of the rays have broadly rounded corners and in 
the middle often a large broad deepening (Fig.6 A). This is espe- 
cially developed in the older dise but is also often to be found 
even in quite young. However it may be pointed out that spe- 
cimens occur where the apices of the rays are abrupt or have 
only an undulated margin. 
