CONTENTS. 
Transactions op the Society — page 
I. New British Freshwater Algae. By William West, F.L.S., assisted by 
G. S. West. (Plates I. and II.) 1 
II. The President’s Address: The Progress and Present State of our 
Knowledge of the Acari. By A. D. Michael, F.L.S 18 
III. The Foraminifera of the Gault of Folkestone. — V. By Frederick 
Chapman, F.R.M.S. (Plates III. and IY.) 153 
IV. An Inexpensive Screen for Monochromatic Light. By J. William 
Gifford, F.R.M.S. (Plate V.) 164 
V. On Fucitrogus Rhodymenise, a Gall-producing Copepod. By G. S. 
Brady, M.D., LL.D., F.R.S. (Plate V.) 1G8 
YI. Notes on the Uropodinae. By A. D. Michael, P.R.M.S., F.L.S., 
VII. The Foraminifera of the Gault of Folkestone. — VI. By Frederick 
Chapman, F.R.M.S. (Plate VIII.) 421 
VIII. On the Unreliability of certain Characters, generally accepted for Specific 
Diagnosis in the Diatomaceae. By Thomas Comber, F.R.M.S., F.L.S. 428 
IX. The Foraminifera of the Gault of Folkestone. — VII. By Frederick 
Chapman, F.R.M.S. (Plates IX. and X.) 645 
X. On a Simple Method of Measuring the Refractive Indices of Mounting 
and Immersion Media. By Edward M. Nelson, F.R.M.S 655 
Summary of Current Researches relating to Zoology and Botany (prin- 
cipally Invertebrata and Cryptogamia), Microscopy, &c., including 
Original Communications from Fellows and Others.* 
34, 171, 320, 433, 541, 660 
ZOOLOGY. 
A. — Vertebrata : — Embryology, Histology, and General. 
Born, G., & W. Roux — 'Experimental Embryology 34 
Goronowitsch, N. — Ectodermic Origin of Skeletal Rudiments 35 
Mall, F. — Human Embryo of Second Week 35 
Aby, F. S.- — Development of Hypophysis Cerebri in the Domestic Cat 35 
Haycraft, J. B. — Development of Wolffian Body in Chick and Rabbit 36 
Kukenthal, W. — Dentition of Pinnipedia 36 
Rose, C. — Dentition of Wombat 37 
Goronowitsch, N. — Ganglion Ridges in the Head of Birds 37 
Leche, W. — Development of Teeth in Iguana 38 
Bemmelen, J. F. van — Development of Gill-pouches and Aortic Arches in Clielonia 38 
Fick, R. — Maturation and Fertilization of Egg of Axolotl 38 
Platt, J. B. — Ontogenetic Differentiations of Ectoderm in Necturus 39 
Morgan, T. H. — Experimental Studies on Eggs of Teleosteans 40 
* In order to make the Contents complete, (1) the papers printed in the ‘ Trans- 
actions,’ (2) the abstracts of the ‘Bibliography,’ and (3) the notes printed in the 
‘ Proceedings ’ are included here. 
