572 



(alive and mounted in fluid). These minute but most beautiful 

 creatures are found in stable refuse, husks of chaff, etc., in 

 company with many other mites and creeping things more 

 interesting than beautiful. The Chelifers (also shown alive) 

 come from the same sources, but in drier places. 



Mr. H. E. Freeman : Atrojnne. This substance, on crystal- 

 lising, manifests a strong antipathy to air bubbles. Solid 

 particles are quickly surrounded by the advancing wave of 

 crystalUsation ; but if an air bubble is encountered, a point is 

 thrown out to push it away, and often a second and a third 

 point will attack the bubble and carry it forward a considerable 

 distance. The slide shown was prepared by the Rev. C. K. N. 

 Burrows, who called attention to the curious action just noted. 



Mr. K. I. Marks: A gathering from the "Moat" Church, 

 Finchley, containing the following Rotifera : Euchlanis dilatata, 

 Oecistes inter medius, Colurus bicuspidatus, Stephanoceros eichhornii, 

 Botifer vulgaris, Rotifer tardus., Dinocharis jyocillum, Diaschiza 

 lacinulata, Stephanops lamellaris, Anuraea curvicornis, and 

 Pompholyx complanata. 



Mr. J. T. Holder : Section through entire eye of foetal guinea- 

 pig, showing cornea, sclerotic and choroid coats, retina, lens, iris, 

 etc. Note transition of epithelium into lens fibres. 



Mr. F. J. Cheshire : Methods of, and apparatus for, examining 

 the upper focal plane of microscope objectives : (1) Eye alone, 

 or better, a stop on the draw-tube instead of an eye-piece ; (2) A 

 low-power objective in the lower end of the draw-tube with a 

 stop approximately in its upper focal plane; (3) Zeiss's axial- 

 image eye-piece (optically equivalent to the second method) ; 

 (4) Eye-ring method. A stop is placed in a low-power eye- 

 piece (preferably 50 mm.), and the eye-ring is examined with a 

 magnifier x 16 or x 20. 



Mr. D. Bryce, on behalf of Signor Piovanelli of Rome : Living 

 specimens of Telphusa Jiuviatilis, the common fresh-water crab 

 of Italy. Also living examples of Callidina cancrophila and 

 Anomopus telphusae, two new species found parasitic within 

 the branchial cavities of this crab by Signor Piovanelli. (See 

 his paper, read at this meeting, p. 521.) 



Mr. D. Bryce : Philodina nenioralis n. sp. (See paper, p. 523.) 



