138 Proceedings of tJie Royal Society of Victoria. 



Zoai'iiun consisting of dichotoniously divided branches, incurved 

 and intricately interwoven. Internodes short, straight and 

 occupied for nearly their whole length by a biserial cluster of 

 about five pairs of zocecia, which gradually increase in length 

 from the proximal to the distal. Two long, hollow, curved 

 processes articulated at the end of each zocecial cluster. 



Port Phillip Heads. Guichen Bay, South Australia, Rev. J. 

 T. Woods. Port Jackson. 



This is undoubtedly the A. cornuta of Lamaroux, although he 

 tjnly figures a single row of zooecia ; and there is no doubt it is 

 nlso the species intended by Tenison Woods, but which I wrongly 

 referred in the Zoology of Victoria to that previously described 

 by Goldstein as A. Woodsii. It is distinguished by the zooecia 

 in the clusters increasing slightly in height from the proximal 

 to the distal, and by the peculiar processes from the anterior 

 extremity of the clusters. 



II. A. Woodsii, Goldstein. 

 (Plate B., Fig. 5.) 



Aviathia Woodsii^ Goldstein, Journ. Microsc. Soct. Vict., 1879. 



A. Australis, IMacGillivrary in McCoy's Prod. Zool, Vict., pi., 

 185, fig. 5. 



Zoarium forming tufts several inches high of dichotomously 

 divided branches. Internodes of moderate length, slightly 

 arched, each occupied for three-fourths of its length by a biserial 

 cluster of o-T pairs of zocecia, diminishing regularly in height 

 from the proximal to the distal ; the terminal . clusters having 

 beyond the distal zooecia a pair of large, confervoid and frequently 

 branched processes ; and occasionally a similar process replacing 

 a branch at a bifurcation. 



Port Phillip Heads. South Australia. Port Jackson. Port 

 Stephen, N.S.AV., Baron von Mueller. 



At once distinguished by the regularly diminishing clusters 

 of zooecia and the long branched confervoid processes. One of 

 these processes frequently seems to replace a branch at a bifurca- 

 tion. They ought possibly to he considered as young or aborted 

 branches. 



