CONTENTS OF No. 207.—New Series. 
MEMOIRS: 
Materials for a Monograph of the Ascons. I1.—The Formation of 
Spicules in the Genus Leucosolenia, with some Notes on the 
Histology of the Sponges. By H. A. Mincutn, M.A., Professor of 
Protozoology in the University of London. (With Plates 17—21, 
and 5 Text-figures) . 
On Merisia lyonsi, a New Hydromedusan from Lake Qurun. By 
Cuares L. Boutencer, B.A., King’s College, Cambridge. (With 
Pilates 22 and 23) : : : : : 
The Distribution and Classification of the Onychophora. By Apam 
SEpDGWwIcK, Professor of Zoology and Comparative Anatomy in the 
University of Cambridge. (With 13 Figures) 
A few Observations on the Encystation of Actinospherium eich- 
horni under different conditions of Temperature. By Doris L. 
Macxinnoy, B.Se., Carnegie Scholar, 1906-1907. (With Plate 24 
and 1 Text-figure) : ‘ : i : : 
On Archerina, Golenkinia, and Botryococcus. By Sir Ray LAanKESTER, 
K.C.B., F.R.S. (With Plate 25) 
