^Ki^SarriTw.'''] PKOCEEDINGS OF SOCIETIES. 61 



meetings by a regular succession of papers ; and in response, several 

 members imdertook to provide for the coming monthly meetings. 



He then read a pajjer (prepared by Mr. Tatem) " On Collecting and 

 Mounting Entomostraca ;" in which the late Mr. Clayton's method of 

 collecting, cleaning, and mounting (as well as the medium), was fully 

 described. [This appeared in our November number. Ed. M. M. J.] 



Mr. Tatem exhibited drawings of Clathrulina elegans (Cienkowski), 

 first obtained in 1864, and repeatedly since, from a ditch near the 

 Cattle-market, Eeading. In all instances these organisms were per- 

 fectly colourless, the reticulation more polygonal, and the pseudo- 

 podia shorter and weaker than in the figure recently given in the 

 ' Quarterly Jom-nal of Microscopical Science.' Mr. Tatem considered 

 the brown tinge of Mr. Archer's specimen due to bog-water, from 

 which, possibly, it may have been procui"ed ; and further remarked 

 that if the definition of Podophrija as "a stalked Actinophryan " is to 

 be maintained, he could see no good reason for its removal from that 

 genus. 



He also exhibited Notommata parasita in Volvox globator, and a 

 series of mounts of ovipositors of saw-flies. 



Captain Lang exhibited the gizzard of Elater nigra; stomach, 

 pylorus, rectal papilla, ovary, &c., of blow-fly ; head, oesophagus, and 

 gizzard of Corethra plumicornis ; Arcella vulgaris, mounted in a 

 mixture of Eimington's jelly and glycerine ; tongue of Trochus, 

 mounted in the same medium ; and Bacillaria paradoxa, dry. 



Mr. Amner exhibited embryo mussels. 



November 16th. — At this the Annual Meeting of the Society, 

 after the report and balance-sheet had been considered, and the usual 

 business transacted, Captain Lang read a paper " On Diatomacese,' ' 

 having for its object the discussion of different plans of arrangement 

 proposed by the most noted Diatomists. These he considered to be 

 two : Professor William Smith's, based upon the mode of growth, 

 leading to a division into three principal families, the free, the adhe- 

 rent, and the frondose, subdivided into tribes, sub-tribes, and genera ; . 

 according to the existence or non-existence of gelatinous envelope, &c. ; 

 and the system adoj)ted by Kiitzing, Grunow, Ealfs, Heiberg, and others, 

 based upon the form and structure of the individual frustules. He 

 also entered into the merits of Eeade's prism and of immersion lenses, 

 as aids in the study of diatoms, and incidentally referred to Dr. 

 Macdonald's views of diatom development, and to Mr. Stoddart's 

 theory of the two-layered structure of the diatom-valve. 



The paper was illustrated by a series of slides, showing types of 

 genera as arranged by Professor William Smith, and by MoUer's 

 No. 1 type slide. 



Brighton and Sussex Natural History Society.* 



November 11th. — The President, Mr. T. H. Hennah, in the chair. 

 A rare grass, Gastridium Lendigerum, obtained October, 1869, in the 

 Weald of Sussex, by Mr. Davies, was presented by that gentleman. 



A paper " On Mosses " was read by Mr. Smith, in which the 



* Keport supplied by Mr. Wonfor. 



