PROCEEDINGS OF THE QUEKETT MICROSCOPICAL CLUB. 341 



The list of donations to the Club was read, and the thanks of 

 the members were voted to the donors. 



Mr. S. C. Akehurst (Hon. librarian) read a note on "A 

 Changer for Use with Sub-stage Condensers." The method of 

 using the changer was demonstrated to the members. 



Mr. S. C. Akehurst also read a note on " A Trap for Free- 

 swimming Organisms." Two forms of the little piece of apparatus 

 were exhibited, and details demonstrated by drawings on the 

 blackboard. 



The President said he had examined the extremely ingenious 

 contrivance for quickly changing the condenser. It was a matter 

 which very strongly appealed to him, as he had often much 

 trouble in changing condensers. 



Mr. D. J. Scourfield, referring to the trap for free-swimming 

 organisms, said this method opened new possibilities w T hen 

 dealing with extremely minute organisms. One can get to a 

 certain point with the centrifuge ; but it is sometimes desired to 

 go a little further in concentrating. He thought it a very 

 ingenious piece of apparatus. 



A paper on " The Gastrotricha," communicated by Mr. James 

 Murray, F.R.S.E., was introduced by Mr. Scourfield, who said 

 that it was just twenty-four years since the subject had pre- 

 viously been brought before the notice of the Club. This was 

 a paper read by T. Spencer on September 27, 1889, on a new 

 species he provisionally named Polyarthra fasiforniis. This is 

 now Stylochaeta fusiformis. Mi 1 . Murray said that he had 

 been reluctant to attempt an introduction to the study of the 

 Gastrotricha, as his knowledge of the group was by no means 

 profound, and had been only recently acquired. The main part 

 of the paper is an annotated bibliography which it was hoped 

 would save students much of the trouble the author had ex- 

 perienced. If the bibliography be too condensed, the student is 

 always liable to suspect that a work omitted from it has not 

 come to the knowledge of the compiler. Here, however, all 

 important general, biological and systematic works known to 

 the author are included, as well as any really important 

 faunistic studies. Every work is given in which new, or sup- 

 posed new, species or groups of higher value are described. It 

 is unfortunate that the Gastrotricha which include those old 

 familiar friends of the students of pond-life, Chaetonotus lanes 



