CONTENTS. 



Transactions of the Society — 



PAGE 



I. — On (Ecisfes Janus and Floscularia trifolium, two new Species of 

 Rotifers. By C, T. Hudson, M.A., LL.D., F.E.M.S. 



(Plates I. and II.) Parti 1 



II. — On a Radiolarian and some Microspongida from consider- 

 able depths in the Atlantic Ocean. By Professor P. 

 Martin Duncan, M.B. (Lond.), F.R.S., &c., Vice-Pres. 

 R.M.S. (Plate III.) Part 2 173 



III.— The President's Address. By Lionel S. Beale, F.R.S. .. „ 180 



IV. — On the Conditions of Orthoscopic and Pseudoscopic Effects 

 in the Binocular Microscope. By Professor E. Abbe, 

 Hon. F.R.M.S. (Figs. 36-38) „ 203 



V. — On a Species of Aoarus, believed to be Unrecorded. By 



A. D. Michael, F.L.S., F.R.M.S. (Plate IV.) .... „ 212 

 VI.— The Diatoms of the London Clay. By W. H. Shrubsole, 

 F.G.S. With a List of Species, and Remarks. By 

 F. Kitton, Hon. F.R.M.S. (Plate V. Fig. 1) Part 3 381 



VII. — On the Estimation of Aperture in the Microscope. By 



Professor E. Abbe, Hon. F.E.M.S. (Figs. 111-113) .. „ 388 

 VIII. — On a New Species of Hydrosera (Wallich). By Henry 



Stolterfoth, M.D. (Plate V. Figs. 2 and 3) „ 424 



IX. — On some Remarkable Enlargements of the Axial Canals of 

 Sponge Spicules, and their Causes. By Professor P. 

 Martin Duncan, M.B., F.R.S., Pros. R.M.S., Professor of 

 Geology and Mineralogy in King's College, London. 



(Plates VIL and VIII.) Part 4 557 



X. — On a Blue and Scarlet Double Stain, suitable for Nerve and 

 many other Animal Tissues. By B. Wills Richardson, 

 F.R.O.S.I., Vice-President, University of Dublin Bio- 

 logical Association „ 573 



XI. — On a supposed New Boring Annelid. By Charles Stewart, 



M.R.C.S., F.L.S., Sec. R.M.S. (Plate IX.) Part 5 717 



XII. — Diatoms from Peruvian Guano. By Rev. Lewis G. Mills, 



LL.D., F.R.M.S., &c. (Plate XL) Part 6 865 



XIII. — Multiple Staining of Animal Tissues with Picro-carmine, 

 Iodine, and Malachite-green Dyes, and of Vegetable 

 Tissues with Atlas-scarlet, Soluble Blue, Iodine, and 

 Malachite - green Dyes. By B. Wills Richardson, 

 F.R.C.S.I., Vice-President, University of Dublin Bio- 

 logical Association „ 868 



