46 Proceedings of the Royal Society of VictoHa. 



J. Barnard, and F. G. A. Barnard for information respecting the 

 diatomaceous deposit. I was not familiar with the paper by 

 Dr. Coates till considerably after this paper was read. I desire 

 to thank Professor Gregory, D.Sc, F.R.S., for considerately 

 allowing the new material referred to herein to be microscopically 

 examined in the Geological Laboratory at the University, and 

 also Mr. H. J. Grayson for kindly making the examination. Mr. 

 Grayson has determined the occurrence of diatoms belonging to 

 the genera Campylodiscus, Actinocyclus, Surirella, Navicula, and 

 Inclosira in the material from the most easterly cutting, and also 

 a few spicules of a sponge belonging to the genus Spongilla. Tn 

 one of the beds here half of the material consists of diatoms, 

 almost exclusively Actinocyclus with a few Campylodiscus. The 

 shell-bearing clay above the basalt contains no diatoms except an 

 occasional frustule of Campylodiscus. Mr. Grayson had himself 

 collected some diatomaceous earth at a depth of 5 feet from the 

 surface, close to the spot from which the collection examined by 

 Dr. Coates was made. He found that the prevailing diatoms 

 were those belonging to the first four mentioned genera, and that 

 the material differs in no way from the Punt Road samples. He 

 also says that diatoms are abundant at Coode Island and West 

 Melbourne lagoon at a depth of about 5 feet, near the Corpora- 

 tion Freezing Works in Flinders Street, Melbourne, and in 

 sewerage works on the southern side of the Yarra River on the 

 Port Melbourne flat. It will thus be seen that they occur over a 

 large area of the low land in the metropolis. — 7.vi.02]. 



