Land and Freshwater Mollusks. 39 



Saturday, June Sth, 1867. 



The Twenty-eighth meeting of the Society was held at Mr. 

 Griffith's House. 



The objects exhibited were : — 



Lichens, of the order Graphldiae ; so named from their resemblance in 



form to certain Oriental alphabetic characters. Br Mk. Farrar. 



Some Photographs of the Dodo . . . . By Mr. Griffith. 



Mr. Griffith gave an account of the formation of the spectrum 

 by refraction through a prism, pointed out the differences of the 

 spectra due to different sources of light, and explained the use of 

 the spectroscope. He illustrated his remarks by several spec- 

 troscopes of various forms. 



Thursday, June 20th, 1867. 



The Twenty-ninth Meeting of the Society was held at Mr. 

 Hayward's House. 



Maudslay was elected a member. 



There was exhibited : 

 A Collection of Shells . . . . . . . . By Evans. 



The Society having offered a prize for the best collection of 

 shells from Harrow and its neighbourhood, the following Paper, 

 containing many valuable suggestions for collectors, was kindly 

 communicated to the Society by R. Soden Smith, Esq., of the 

 South Kensington Museum, through the Rev. E. H. Bradby. 



LAND AND FKESHWATER MOLLUSKS. 



The land and freshwater mollusca of Great Britain — the recent 

 not the fossil mollusca — are not very numerous either in the num- 

 ber of species, or, with a few exceptions, in the number of indi- 



