140 Proceedings of the Royal Society of Victoria. 



pairs, each pair from an opposite side of the stem to the 

 succeeding, the zocecia being turned shghtly towards the stems ; 

 each branch bifurcates, the internode before bifurcation occupied, 

 except at the basal portion, by a biserial cluster of about six 

 pairs of cylindrical zooecia and each branch of a bifurcation 

 having a similar or smaller group ; each of these branches termi- 

 nating in a pair of confervoid filaments which again divide at 

 their extremities. 



Port Philip Heads. 



A beautiful species distinguished from all the others by the 

 barren primary stems and the opposite celliferous branches with 

 the confervoid terminatinii; filaments. 



EXPLANATION OF FIGURES. 



Plate A. 



Fig. 1. — Amathia spiralis, nat. size. Fig. la. — Portion magnified. 

 Fig. 2. — A. bicornis, nat. size. Fig. '2a. — Portion magnified. 



Fig. '2/>. — Group of Zooecia more highly magnified. 

 Fig. 3. — A. convoluta, nat. size. Fig. 3«. — Portion magnified. 



Fig. ?>l>. — Another portion of the same. 

 Fig. 4. — A. tortviosa, nat. size. Fig. 4rt. — Portion magnified. 



Plate B. 

 -A. lendigera, nat. size. Fig. la. — Portion magnified. 

 -A. obliqua, nat. size. Fig 2fl. — Portion magnified. 

 -A. Brogniartii, nat. size. Fig. 'ia. — Portion magnified. 

 -A. biseriata, nat. size. Fig. 4^. — Portion magnified. 

 -A. Woodsii, nat. size. Fig. Da. — Portion magnified. 



Plate C. 

 -A. pinnata, nat. size. Fig. \a. — Portion magnified. 

 -A. plumosa, nat. size. Fig. 2a. — Portion magnified. 

 -A. distans, nat. size. Fig. ?>a. — Portion magnified. 



Plate D. 

 -A. cornuta, nat. size. Fig. \a.- — Portion magnified. 

 -A. Wilsoni, nat. size. Fig. 2a. — Portion of anterior 



aspect of branch magnified. Fig. 2l>. — Portion of 



posterior surface of .same. 



