356 rEOCEEDlNGS OF THE SOCIETY, 



Bj Mr. H. J. Howard : — Physarum carneitm ; P. lateritium ; P. pene- 

 trale Rex. 



By Mr. D. J. Scourfield, F.Z.S.:— 



Sjyhserceca volvox, a colonial Choanoflagellate. 



By Mr. E. J. Sheppard :— 



1. Ovo-testis ill the frog. 



2. Extrusion of nuclear material in LiUiim croceum in association 



with the synaptic stage in mitosis. 



AK ORDINARY MEETING 



OF THE Society was held on Wednesday, May 16th, 1917, 

 AT 20 Hanover Square, W., Mr. E. Heron-Allen, F.L.S., 

 F.G.S., etc.. President, in the Chair. 



The Minutes of the preceding Meeting having been circulated were 

 taken as read, confirmed and signed. 



The President intimated that a ballot would be taken for the election 

 of the following gentlemen, and subsequently announced that they had 

 been duly elected: — Mr. Ernest Atkinson, Dr. Alfred B. Hichins, 

 Dr. Charles Llewellyn H. Tripp. 



The President then called upon Mr. Scourfield to make some 

 observations on the exhibition of Pond-life which had been arranged by 

 Fellows of the Society and Members of the Quekett Microscopical Club. 



Mr. Scourfield said that before dealing specifically with the Pond- 

 Kfe organisms exhibited that evening he would like to say a few words 

 about one aspect of the living activities of such organisms, namely, the 

 various kinds of movement which they presented. It was true that all 

 pond-life organisms did not show signs of movement, but it was safe to 

 say that the majority did so, and in any case the question of movement 

 was a very attractive one in itself and one which had by no means been 

 exhaustively investigated. No doubt the different types of movement 

 which were found to occur could be grouped or classified in various 

 ways, but he thought some such scheme as the following would be found 

 useful in considering the matter. First of all there were what might be 

 called the primitive protoplasmic movements. In the last resort, of 

 course, most movements among living organisms were protoplasmic, but 

 some were self-evidently so, and others, such as the movements of 

 flagella, cilia, and muscles, were not. Between the two were certain 

 types, e.g. the movements exhibited by Diatoms, Oscillatoria, and 

 Desmids, which could not be definitely assigned to one or the other in 

 the present state of our knowledge. 



