Ser. 2, Vol. 9, No. 54.] APRIL, 1904. [Price 3s. 6d. net. 



THE JOURNAL <2>^* Jy ^ t 



OF THE N "— ' 



QUEKETT MICROSCOPICAL CLUB. 



EDITED BY * 



FRANK P. SMITH. 



(It ivill be understood that the Authors alone are responsible for the views and 



opinions expressed in their papers.') 



CONTENTS. 



Papers. page 



F. J. Cheshire, F.R.M.S. Abbe's Test of Aplanatism, and a simple Aper- 



tometer derived therefrom (Illustrated) 1 



F. P. Smith. The Spiders of the Sub-family Erigoninae (Plate 1) .9 



J. Rheinberg, F.R.M.S. An Overlooked Point Concerning the Resolving 



Power of the Microscope (Illustrated) 21 



D. J. Scourfield, F.R.M.S. Synopsis of the Known Species of British 



Fresh-water Entomostraca. Part III. Ostracoda, Phyllopoda, and 



Branchiura (Plate 2) 29 



C. F. Rousselet, F.R.M.S. On a new Fresh-water Polyzoon from Rhodesia, 



Lophopodella thomasi, gen. et sp. nov. (Plate 3) . . . .45 



G-. Massee, F.L.S. President's Address: Some Plant Diseases caused by 



Fungi 57 



V. VAVRA, Ph.D. On the Phyllopods Limnadia lenticularis (L.) and Lim- 



netis brachyura (O.F.M.), and their occurrence in Bohemia (Plate 4) . 63 



Notes. 



W. J. Wood, F.R.M.S. Note on Ebonising Laboratory Tables . . .67 

 Rev. H. A. Soames, M.A., F.R.M.S. Note on the Sertulariidae of Kent and 



Sussex 69 



Proceedings, etc. 



Proceedings from October 16th, 1903, to February 19th, 1904, inclusive . 71 



Thirtv-eighth Annual Report (for 1903) 75 



Report of the Treasurer (for 1903) ...... . . 80 



^Lontion : 



[Published for the Club] 



WILLIAMS AND NORGATE, 



14, HENRIETTA STREET, COVENT GARDEN, LONDON 



AND 7 BROAD STREET, OXFORD. 



