362 NOTES AND EXHIBITS. 



attachment and reproduction (so far not recorded), the deter- 

 mination of which is of great value in connection with the 

 affinities of the Archeocyathince. Many slabs are crowded with 

 minute calices showing varying degrees of complexity in their 

 septation. 



Mr. Griffith Taylor also exhibited, in the absence of Mr. H. I. 

 Jensen, specimens of diatomaceous earth from Bugaldie, north of 

 the Warrumbungle Mountains. The deposit occurs near the 

 summit of a basaltic mountain, Mt. Chalker or Chalk Mountain, 

 at an elevation of about 2,260 feet. It apparently represents a 

 deposit formed in a geyser or crater lake and afterwards covered 

 with a lava flow. 



Mr. H. J. Carter exhibited the type specimens of Cardiothorax 

 described in his paper which was read at the preceding meeting. 



Dr. E. S. Stokes showed drawings and microscopic preparations 

 illustrating the structure of Fredericella sultana, var., Anabcena 

 sp. and Peridinium sp.. all taken from the upper reaches of the 

 Sydney Water Supply. The effect of the growth of these upon 

 the quality of the water was described. 



Mr. A. G. Hamilton exhibited a ball of vegetable fibre similar 

 to that exhibited at the last meeting by Mr. R. T. Baker. It 

 was picked up on a beach near Albany, W.A., where there was 

 an area of 3 or 4 acres covered with balls and cylinders rolled by 

 the action of the waves. The bay was shallow and the bottom 

 covered with a thick growth of some grass-leaved plant like 

 Zostera, and it was from the decayed leaves that the fibre was 

 derived. As there were no flowers or fruits it was impossible to 

 determine the plant. 



Dr Chapman drew the attention of members to a variation in 

 the reaction between Hyla aurea and strychnine. He pointed 

 out that frogs obtained in the neighbourhood of Sydney rarely 

 showed typical convulsant action, but a paratysis of peripheral 

 nerve endings. Further research was being carried out to 

 determine the cause of this variation. 



