lU 



CONTENTS. 



PART No. 48, APRIL 1901. 

 Papers. 



TAGE 



A. A. Merlin, F.R.M.8. On the Resolution of A mpJiijjleura pellvoida, 



etc., with a Dry Lens and Axial Illumination. .... 1 



C. F. RoussELET, F.R.M.S. On the Specific Characters of Asplanchna 



intermedia, Hudson (Plate 1) 7 



J. Rheinberg, F.R.M.S. The Origin of certain Colour Phenomena 



typically shown by ^cz^nio<^?/cZ?<s ^«//s// (Illu^trated) . . .18 



F. R. Dixox-XUTTALL, F.R.M.S. On Diaschlza re?itrijjes—a, New 



Rotifer (Plate 2) 25 



M. F. DuNLOP. On a New Rotifer, Cathy pna lUjona (Plate 2) . .29 



G. W. KiRKALDY, F.E.S. The Stridulating Organs of Waterbugs 



(Rhynchota), especially of Corixidae (Plates 3 and 4) . , .33 



C. D. Soar, F.R.M.S. An unrecorded Hydrachnid found in North 



Wales (Plate 5) 47 



D. J. ScouRFiELD, F.R.M.S. The Ephippium of ^(W;«rta (Plate 6) . 51 

 G. Massee, F.L.S. President's Address 57 



Notes. 



E. G. Wheler. a remarkable Stigmatic Organ in the Nymph of 



Ornithodoros meg7ilni (Illustrated) . . . . . .61 



J. Rheinberg, F.R.M.S. A New Arrangement for Viewing Diffrac- 

 tion Spectra (Illustrated) 63 



C. D. Soar, F.R.M.S. The Occurrence of Larval Water-Mites on 



various Aquatic Animals (Illustrated) 65 



Note on Some Portable Microscopes (Illustrated) 67 



Reviews. 



Notices of Chalmers Mitchell's " Thomas^ Henry Huxley"; Miall 

 & Hammonds " Structure and Life-History of the Harlequin Fly 

 {Chironomn.^)" ; Schmeil's "Text-Book of Zoology"; GRANT 

 Allen's " In Nature's Workshop " ; Strasburgers " Handbook 

 of Practical Botany " ; Bonnier & Leclbrc du Sablon's " Cours 

 de Botanique"; Galt's "Microscopy of the more commonly 

 occurring Starches " ; Rinne's " Das Mikroskop im chemischen 

 Laboratorium " ; Kaiser's " Die Technik des modernen Mikro- 

 skopes"; and Fobel's " Handbuch der Seenkunde " . . .75 



65176 



