346 



• 

 to the usual entrance door, has another movable door so? 

 little distance down the hole. The second door, which i 

 formed of a lump of clay, is secured to the side of the nest 

 by a web lining, and when open is drawn back into a recess 

 in the side. Diagrams upon the blackboard were drawn by 

 The Pbesident and Dr. Pulleine, illustrating other kinds 

 of spider nests which showed various devices for excluding 

 the natural enemies of the spider. Dr. Rogers, Dr. Pul- 

 leine, and Professor Rennie testified to the dangerous nature 

 of bites by some spiders. 



Papers. — "Notes on South Australian Marine Mollusca, 

 with Descriptions of New Species," Part x., by J. C. Verco, 

 M.D. Dr. Verco selected from his paper some interesting 

 details of the habits and structures of certain molluscs which 

 he illustrated by shells and drawings of shells. Among the 

 former were two specimens of the carrier fXenophonis ), with 

 their load of rock and shell fragments firmly embedded in 

 the tests. Volutes, Trophons, a Doridium, etc., were also ex- 

 hibited by Dr. Verco. "A Critical Review of South Aus- 

 tralian Prasoph3rlla, together with a Description of Some New 

 Species," by R. S. Rogers, M.A., M.D. 



Ordinary Meeting, July 6, 1909. 



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

 chair. 



Exhibits. — Professor R. W. Chapman exhibited a 

 washer which had been bent, and which in the bending had 

 developed a remarkable series of geometrical lines, known as 

 "Luder's lines," on its surface ; also steel bars, which had 

 been subjected to a severe longitudinal strain. He showed 

 the effect of a small hole drilled in such a bar when sub- 

 jected to tension. Mr. D. Maavson, B.Sc, B.E., tabled 

 specimens obtained during the Antarctic Expedition — a form 

 of lava from Mount Erebus ; kenite, a mineral which is 

 found only in one other part of the word, at Mount Kenia, 

 in Central Africa ; ice-polished pebbles ; red fungus from 

 fresh-water lakes ; black and yellow lichens, the only forms 

 of vegetation found on the Antarctic continent. The Presi- 

 dent took the opportunity of congratulating Mr. Mawson on 

 his pai-ticipation in an undertaking which had achieved such 

 important discoveries as Shackleton's British Antarctic Ex- 

 pedition, and on the excellent work which he had been able 

 to accomplish as a member of the party. He assured Mr. 

 Mawson of the pleasure with which all those who were pre- 

 sent greeted him on his safe return. 



Papers. — ''Note on a Remarkable Grrowth of Coral in 

 Gulf St. Vincent," by W. Howchin, F.G.S. Mr. Howchin 



