193 



colour between the nucleus and the crust is very common. 

 In addition, the tourmaline is characterised by its insolubility 

 in hydrofluoric acid and its intense reaction with beracic 

 acid. 



The binding material of the breccia consists of a crystalline 

 and granular mixture of quartz and tourmaline. The quartz 

 is concentrated in more or less extensive round patches of a 

 white colour, and is finely granular. Here and there are also 

 found isolated larger quartz crystals. The binding material 

 contains many minute hollow spaces, the walls of which are 

 covered by minute quartz crystals and hair-like tourmaline 

 needles. 



Attempts to find topaz in this breccia wore productive of 

 no definite result. 



It remains undecided, therefore, whether the Tasmanian 

 tourmaline-quarzit slate has undergone a transformation into 

 topaz, as is the case in that of Saxony. 



' 



THE TROCHIDiE AND OTHER GENERA OF 

 MOLLUSC A FROM TASMANIA, WITH THEIR 

 SYNONYMS. 



Past I. 



By John Brazier, F.LS, O.M.Z.S. : 

 Tasmania. 



CM. Royal Soc, 



Having paid considerable attention to the Molluscan Fauna 

 of Tasmania during the last 30 years, it is my intention, 

 from time to time, to give to the Royal Society of Tasmania 

 the benefit of my investigations. I now send my first paper 

 on Trochid/s and other Genera of Mollusca : — 



Part 1.— The coast of Tasmania is rich in Trocliidce. The 

 Rev. Tenison- Woods appears to have done some good work 

 in the recent species in his Census in the Proc. of the Society, 

 1877, published 1878. Some of the species are incorrectly 

 identified, for instance, he quotes Thalotia picta, Wood. 

 The Thalotia so quoted is a very narrow form of Trochus 

 {Thalotia) conicus, Gray. The Thalotia picta of Tenison- 

 Woods is the Phasiandla elegans of Lamarck. Kiener, in his 

 Coquilles Vivantes, having charge of Lamarck's collection, 

 found out that it belonged to Trocliidce, and called it Trochus 

 elegans. There being already in the genus Trochus, anelegans, 

 Dr. Fischer named it Trochus Lesueuri. The Thalotia marice, 

 Tenison- Woods, is the Trochus pulcherrimus, Gray, well 



L 



