49 



these fragments I could never trace a single specimen of the 

 two characteristic shells belonging to the Turritella Limestone 

 of Flinders' Island. I incline to the oj^inion that the Turri- 

 tella Limestone may yet turn out to be the lowest member of 

 the tertiary system hitherto found. I intend, at the earliest 

 opportunity, to examine this deposit more minutely. 



I have been informed by the Rev. Canon Brownrigg that a 

 white fossiliferous limestone is exposed on the road from the 

 shore to the Lighthouse, on Kent's G-roup. If the Light- 

 house Superintendent were applied to for his kindly assist- 

 ance, a number of specimens might be obtained for the 

 Society's Museum, and for the use of those who may wish to 

 study the subject. Perhaps some of the Fellows may have 

 business relations there. If so, a box of specimens might 

 easily be obtained by the first vessel which trades between 

 Hobart Town and Kent's G-rouj). 



G-ENEEAL. 



From the foregoing remarks it is evident that there re- 

 mains a great deal to be done before we can speak positively 

 of the relations of the various beds belonging to the tertiary 

 and post tertiary systems of Australia and Tasmania. The 

 discovery, by Professor Tate, of Salenia and Belemnites in 

 the Aldinga beds, is very significant. From this and other 

 considerations the Eev. J. E. Tenison- Woods inclines to the 

 idea that the Aldinga series may be " i^assage beds between 

 our tertiary and secondary rocks." Be this as it may, it is 

 clear that in South Australia, Tasmania, and the Bass' Strait 

 islands we have a series of beds which form a complete chain 

 of evidence, telling of the persistent elevation of the ocean 

 bed from the earliest tertiary period to the jjresent hour — a 

 period sufiiciently vast to encom2)ass the extinction of nearly 

 92 per cent, of the organisms which first inhabited our ter- 

 tiary seas, and to witness the introduction of a new series of 

 species to take the j^laces of those which have disappeared. 



The Eev. J. E. Tenison-Woods, recently, in a paper read 

 before the Linnsean Society of JSTew South Wales, draws 

 particular attention to the remarkable . variability of the 

 various si^ecies of the genus Trochocochlea. In giving the 

 synonomy of Trochocochlea australis, viz. : — 



T. concamerata (Gray.) | T. strioloius (Quoy, G.) 

 Monodenta australis (Lam.) — 

 He states — " Turn over any flat stone at low water, and the 

 vmder side will be fouud covered with it (T. striolatus — Quoy), 

 of almost every size, shape, and color within the limits of 

 the shell's character. I have seen some specimens more than 

 an inch in diameter, some almost conical, some depressedly 



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