60 



2. The Bev: 0. Pickard-Cambridge, F.B.S., C.M.Z.S. 



Contribvitions to the Knowledge of the Spiders and other 

 Arachnids of Switzerland. 



3. Herbert L, Hawkins, M.Sc, F.G.S. 



The Classification, Morphology, and Evolution of the Echi- 

 noidea Holectypoida. 



4. H. Lyster Jameson, M.A., D.Sc, Ph.D., F.Z.S. 



Studies on Pearl-Oysters and Pearls. — I. The Structure of 

 the Shell and Pearls of Margarilifera vulgaris Schumacher : 

 with an examination of the Cestode Theory of Pearl Pro- 

 duction. 



Communications intended for the Scientific Meetings should 

 be addressed to 



P. CHALMERS MITCHELL, 



Secretary. 



Zoological Society op London, 

 Regent's Park, London, IST.W. 



November 28i/i, 1911. 



