7 GO NOTES FROM THE AUSTRALIAN MUSEUM, 



EXPLANATION OF PLATES. 



Fig. L— Group of three saddle-shaped crystals of slderite on quartz : 

 a, b, c refer to each of the three crystals in this and the follow- 

 ing figures. 

 d, saddle-shaped crystal of siderite, isolated among lenticular 

 crystals of calcite, natural size. 



Fig. 2. — Another view of the same. 



Figs. 3 and 4. — The same group of crystals of siderite enlarged twice the 

 natural size, showing one of the extremities of the smaller 

 crystal of quartz. 



In these last two figures the lines .v, y, x', y', represent the edge of the larger 

 crystal of quartz. 



NOTES AND EXHIBITS. 



Mr. Brazier exhibited specimens of Onchidium diameleon, 

 described by him in his Paper, and so named on account of its 

 many changes of colour. 



Mr. Douglas-Ogilby exhibited a specimen of Nannocampus 

 ruber, previously described by himself and Mr. Ramsay. 



Mr. Kyngdon exhibited specimens of Penteune, a fossil fruit 

 found at a depth of 240 feet, under a layer of basalt at the 

 Forest Reef, in the Great Extended Gold Mine, near Bathurst. 



Mr. Whitelegge exhibited a number of water insects (No- 

 tonecta), with small moUusks attached to their legs, and suggested 

 this as a probable way of the distribution of mollusca and fish 

 ova over the country. He also exhibited some fresh water 

 Polyzoa killed with the tentacles fully extended by means of 

 chloroform. 



Dr. von Lendenfeld exhibited a specimen of the Alga-Pseudo- 

 morph, described in his paper, together with a specimen of the 



