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In conclusion, my best thanks are due to Miss Rosa Fiveash 

 for the very great pains bestowed upon the drawings which illus- 

 trate this paper. Accurately and carefully drawn to scale, they 

 will in many instances supply useful information as to size and 

 form, and render more intelligible my own imperfect descriptions. 

 To Mr. H. Barrett, of the South Australian Government Print- 

 ing Office, my thanks are also due for his careful reproduction of 

 the plates, and to the Executive of South Australia for per- 

 mitting the work of a scientific society to be done in a public 

 institution. 



