122 RECORDS OF THE AUSTRALIAN MUSEUM. 
large as the main portions from which they emanate, but not 
again branching. Many of the chains of monillse appear to have 
neither beginning nor ending, but when a termination rises within 
the field it is seen under one of two conditions, either as an 
ordinary refractive, or an enlarged black globule. 
The moniliform cells are usually dark along the margins of the 
chain, and refractive in the middle line, but here and there this 
refractive centre is absent, when the cells are oblong, and of a 
uniform drab-yellow colour. It is only when the cells are destitute 
of a refractive centre that they appear to be oblong, whenever 
the latter is present they are always strictly moniliform. As a 
rule there is no trace of any containing or bounding wall, or of a 
sheath,- although the monillse follow one another with great 
regularity. Instances do occur, however, in which there appear 
to be traces of such a sheath (PL xxiii., fig. 4), and in one par- 
ticular case a chain unquestionably terminates in a clear and 
unoccupied tube (PI. xxiii., fig. 3) ; but this in no way resembles 
the tortuous course of Palcmdilya tortuosa , mihi, or a similar 
form to be described later. At intervals of greater or less extent 
the continuity of the chain is broken by one, two, three, or more 
globules or cells, very much exceeding in size the ordinary monillas, 
and perfectly opaque, in fact quite black (PI. xxiii., fig. 2). In 
only one instance have I observed any deviation from this opacity, 
and then the globule was drab-yellow. A chain may either be ter- 
minated by one of these black cells ; or, one may be attached at the 
side of a chain, out of its alignment, as it were, and similar to a 
figure of Duncan’s,* * * § who terms it an oospore. One of the chains 
without refractive centres is all but terminated with three or more 
circular globules united in a cluster (PI. xxiii., fig. 2), and inthechain 
terminating in the clear tube already referred to, there is a similar 
cluster, with two single black globules in the course of the chain 
also. In a few cases, where the end of a chain has come into view 
it merges into an irregular black mass, as seen by Duncan in a 
Thamnastrcea from the Tasmanian Tertiary. f 
On the other hand, no terminal loculus, crowded with zoospores, 
as Duncan terms them, and figured by him in Calceola sandalina\ 
and in Adilya penetrans^ has come under notice ; but there 
is certainly at one spot a black globule attached to the side 
of a chain, from which a rounded mass of pulverulent matter is 
proceeding, or is attached. In many of the old visceral chambers 
of the Favosites , the black globules, Duncan’s oospores, may be 
seen in a free state, unaccompanied by any moniliform chains. 
Another interesting point remains to be noticed — along the edges 
* Proc. Eoy. Soc., xxv., 174, 1876, pi. vii., fig. 48. 
f Quart. Journ. Geol. Soc., xxxii., 1876, p. 206. 
t Quart. Journ. Geol. Soc., xxxii., 1876, pi. xvi., figs. 12 and 13. 
§ Proc. Eoy. Soc., xxv., 174, 1876, pi. vii., fig. 53. 
