122 RECORDS OF THE AUSTRALIAN MTTSEtTM. 



large as the main portions from which they emanate, but not 

 again branching. Many of the chains of monillfe 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 monillre follow one another with great 

 regularity. Instances do occur, however, in which there appear 

 to be traces of such a sheath (PL xxiii., tig. 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 Falceachlya 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 monillse, 

 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 terras it an oospore. One of the chains 

 without refractive centres is all but terminated with three or more 

 circular globules united in a cluster(P]. 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 sandalinaX 

 and in Achlya penei)'a7is'^ 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 Favosiies, 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., figf. 48. 



t Quart. Journ. Geol. Soc, xxxii., 1876, p. 206. 



X Quart. Journ. Gool. Soc, xxxii., 1876, pi. xvi., figs. 12 and 13. 



§ Proc. Eoy. Soc, xxv., 174, 187G, pi. vii., fig. 53. 



