1]{) Proceedings of the Royal Society of Victoria. 



or bilabiate ; surface smooth, gloss}'^, with a few minute 

 shining granuhitions. 



Differs from L. tuherculata in the absence of pores or 

 tubercles. 



Western Port, a single specimen, Rev. Mr. Poiter. 



Amathia plumosa, n. sp. 



Zoarium large, tufted. Primary branches cylindrical, 

 without zooecia. Secondary branches given off oppositely in 

 pairs, each secondary branch bifurcating, the branch before 

 bifurcation occupied, except at the basal portion, with a 

 cluster of about six pairs of cylindrical zooecia, and each 

 bifurcation having a similar or smaller group, each of these 

 bifurcations terminating on a pair of confervoid filaments, 

 which again divide at their extremities. 



Port Phillip Heads, Mr. J. Bracebridge Wilson. 



EXPLANATION OF FIGURES. 



Fig. 

 Fig. 

 Fis. 



F 

 F 

 F 

 F 

 F 

 F 

 F 

 F 



Fig. 

 F 



Plate IV. 



1 . — Stirparia exilis, natural size. 



la. — Portion magnified. 



lb. — Stem and lower zooecia of the same. 



Plate V. 



1. — Biflustra sericea. 

 2. — Biflustra uncinata. 

 8. — Schizoporella impar. 

 4. — Schizoporella speciosa. 

 4a. — Young zooecium. 

 5. — Schizoporella nodulifera. 

 5a. — Mouth of zooecia. 

 6. — Schizoporella porteri. 

 6a. — Young zooecium. 

 7. — Mucronella mentalis. 

 8. — Lagenipora simplex. 



Art. XVII. — On the Illumination of Public Clocks. 



By Sidney W. Gibbons, F.C.S. 



[Bead December 12, 1889.] 



