327 



l^ushes the dorsal surface of its falces against the wall of tlie 

 tube, immediately below, thrusting the foremost spines into 

 the silken lining, and so effectually locks the door. Again, as 

 to the disposition of the k>gs and claws. There are two punc- 

 tate areas, one on each side of the tube, a little behind the 

 transvei-se diameter. The areas show the pin-pricks, which 

 indicate the holding-ground of the creature's claws. By this 

 means the strain on the tube is distributed at three equi- 

 distant points, manifestly with advantage and safety to the 

 spider. * 



Mr. A. H. C. ZiETZ, F.L.S., mentioned that the spider 

 with wafer operculum was found in the sandhills at Henley 

 Beach and elsewhere. 



Mr. Griffiths showed a very interesting specimen from 

 Western Australia, with a window of silk webbing in the 

 middle of the door. 



Mr. W. HowcHiN, F.G.S.. exhibited examples of the 

 mineral wavellite, a hydrous phosphate of alumina, in two 

 forms. One of these, in the form of small spheres with a 

 radial structure, from the phosphate claims at Pekina. The 

 phosphate mineral occurred in belts and pockets in a decom- 

 }K)sing slate. The other form of the mineral was in mammil- 

 lary nodules, up to six inches in diameter, obtained at Angas- 

 ton. These specimens are interesting from a mineralogical 

 standpoint, but as they are difficult to treat for extraction of 

 phosphoric acid they are not of much commercial value. In 

 Mr. H. Y. L. Brown's printed list of South Australian mine- 

 rals the only locality for wavellite noted is Gawler River, in 

 gneiss. Mr. Howchin also exhibited rock specimens and 

 microscopic sections of an interesting nullipore limestone 

 which occurred over many square miles on Yorke Peninsula, 

 in the neighbourhood of Wallaroo 'Ba.j, Alford, Boors Plains, 

 and Tick era. The rock for a thickness of 15 ft. is almost en- 

 tirely composed of calcareous algte. belonging to the genus 

 lAthnfhamnhmi , a genus, specimens of which can often be 

 picked up on the beaeh on Soutli Australian shores. 



Ordixaky ^Meeting, April 3, 1906. 



The President (J. C. Verco, M.D.. F.R.C.S.) in the 

 chair. 



Exhibits. — Mr. W. Howchin, F.G.S., placed before the 

 meeting a Monograph of the Foraminifera of the Permo-Car- 

 boniferous limestones of New South Wales, recently published 

 by the New South Wales Department of Mines and Agricul- 

 ture, and of which Mr. F. Chapman, of Melbourne Univer- 

 sity, and he (Mr. Howchin) were the joint authors. Mr. 



