162 



He thought Mr. Smith went wrong in arguing from analogy in such cases 

 where one of the difficulties met with was the fact that personal equation 

 was sure to come in, and where that was so he supposed it was scarcely 

 possible to get people entirely to agree. 



Mr. Smith said, with regard to his having thought that Mr. Nelson and 

 Mr. Karop knew nothing about the matter, he was misled by the letterpress, 

 which went on to say that the diatoms consisted of one siliceous membrane. 

 As to the naming of centralis, he had gone by his general knowledge, and of 

 the many specimens which he had examined in no case had he found a bar 

 as described by Mr. Nelson. He got a specimen some time ago which had 

 been mounted by Wheeler, but which he had found too thick for his purpose ; 

 he, therefore, got another slide by another mounter, and found that as 

 regarded species it was precisely the same. As regarded Kittonii, the matter 

 was one which he could not at present solve, and he thought it was only by 

 analogy that it could be solved. 



The thanks of the Society were unanimously voted to Mr. Smith for his 

 paper, and for the exhibition of the specimens in illustration. 



Announcements of meetings and excursions for the ensuing month were 

 then made, and the proceedings terminated with the usual conversazione, 

 when the following objects were exhibited by Mr. Smith in illustration of 

 his paper : — 



Coscinodisctis asteromphalos, in section, bits chipped out of centre. 



Coscinodiscus centralis, showing finer structure, and little bosses at corners 

 of hexagon. 



Coscinodiscus, sp., from Richmond, Virginia ; with broken edge membrane 

 showing over edge of hexagon. 



Aulacodiscus Kittonii, showing eye-spots and hexagons. 



Triceratium, sp., from Hungary, showing fine membrane torn off portions 

 of hexagons. 



Triceratium, sp., from Oamaru deposit, showing broken membrane over 

 hexagons. 



Coscinodiscus, sp., from Jutland, showing membrane in eye-spot. 

 Coscinodiscus, sp., from Oamaru deposit, with granulated membrane in 

 place of eye-spot. 



The following objects were also exhibited : — 



Rivularia articulata ... ... ... Mr. F. W. Andrew. 



Section of garden spider, Epiera) 



diadema, showing the internal ' 



.., , , V Mr. F. Enock. 



anatomy, with an explanatory 



drawing ... ... ) 



Mounted Rotifer, Limnias cerato-\ -** ™- w n i„ n 

 phylli 5 ... ... ... J 



Attendance — Members, 3G ; Visitors, 5. 



