110 PEOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



State Museum, Albany, N.Y. These forms had never been figured, 

 and the diagnoses being too vague, they had been misunderstood by 

 most conchologists. P. repercussa had been considered by several 

 eminent authorities to be synonymous with P. achatina, Gray, while 

 P. refuga was thought to be the same as P. leioplii&, Benson. The 

 photographs, supplemented by sketches and notes, furnished by 

 Dr. Merrell and Ur. Bagg, of the New York State Museum, 

 established beyond doubt that all three forms described by Dr. Gould 

 were distinct from their congeners. Specimens of all these forms, 

 except P. refuga, were exhibited. 



Mr. S. I. da Costa exhibited moUusca from the great African lakes ; 

 Mr. J. E. S. Moore exhibited moUusca fi'om Lake Tanganyika. 



ORDINARY MEETING. 



Peiday, 15th April, 1898. 



Dr. H. Woodward, F.R.S., etc., Vice-President, in the Chair. 



J. R. Masefield was duly elected to membership of the Society, 

 The following communications were read : — 



1. "On some new species of Land-Shells from South America." 

 By S. I. da Costa. 



2. "Note on the Anatomy of Resania, Gray, and Zenatia, Gray." 

 By W. H. Dall. 



3. "Note on the Anatomy of MuUeriaJ'' By M. F. Woodward. 



Mr. E. A. Smith exhibited a specimen of Pleiirotomaria Beyrichii, 

 preserved in spirit with the animal intact and well extended. This 

 he remarked was the only specimen with the animal, which had come 

 into this country. The specimen was examined when alive by 

 Professor Mitsukuri, who published a short description of its 

 characteristics. 



Mr. E. E,. Sykes exhibited and made remarks upon a series of 

 Acliatinella, showing great colour variations. 



Mr. M. F. Woodward exhibited and commented on a series of 

 molluscs preserved in an extended condition. He further alluded 

 to the various methods for killing and preserving molluscs in this 

 condition. 



Mr. S. I. da Costa exhibited specimens in illustration of his paper. 



