OF NEW SOUTH WALES. 9 



This tine shell fell to my share the day that Captain Nares, his 

 Officers, and Professor 0. Wyville Thomson, Director of the 

 Civilian Scientific Staff of H.M.S. Challenger Exploring Expedi- 

 tion, entertained a party of Australian Naturalists to a cruise 

 outside Sydney Heads, to see the deep sea sounding and dredging 

 carried out. And it is with pleasure that I name it after Professor 

 C. W. Thomson. Other new species came up in the same haul, 

 such as Leda, Mitra, Terebra, and Marginella; the rare Typhis 

 Cleryi — Petit was also found for the first time on the New South 

 Wales coast. It is recorded by Mr. G. F. Angas from the coast 

 of New Zealand 



* 14. BlTHINIA HYALINA. 



Shell turbinated, thin, glossy, shining, whitish under a brown 

 epidermis, whorls 5, roundly convex, the last large equalling half 

 the length of the whole shell, aperture somewhat lunate, peristome 

 thickish, margins continuous 



Length 4, breadth 2| lines. 



Hab. Eastern Creek, New South Wales. 



This is the only species of Bithinia that I know of from 

 Australia as being described. It is found in various parts of New 

 South Wales, about Parramatta and Chatsworth ; it is generally 

 found in a corroded state, the apex wholly destroyed in some 

 specimens and covered with a thick hard coating of mud; when 

 washed in clean water and rubbed with a brush it is readily 

 removed 



"Mr. Ramsay read a paper, entitled: — 



Description of a New Species of Ptilotis, from the Endeavour 

 River, with some Remarks on the Natural History of the 

 East Coast Range, near Rockingham Bay." 



