CONTENTS. 
v 
Studies on the Comparative Anatomy of Sponges. II. On the 
Anatomy and Histology of Stelospongus flabelliformis, 
Carter; with Notes on the Development. By Arthur Dendy, 
M.Sc., F.L.S., Demonstrator and Assistant Lecturer in Biology 
in the University of Melbourne. (With Plates XXX, XXXI, 
XXXII, and XXXIII) 
On Some Points in the Natural History of Fungia. By J. J. 
Lister, M.A. ....... 
CONTENTS OE No. CXVI, N.S., APRIL, 1889. 
MEMOIRS: 
Contributions to the Knowledge of Ampbioxus lanceolatus, 
Yarrell. By E. Ray Lankester, M.A., LL.D., F.R.S., Pro- 
fessor in University College, London. (With Plates XXXIV, 
XXXV, XXXVI, XXXVI A and XXXVI B) . 
Studies in the Embryology of the Echinoderms. By H. Bury, 
B.A., F.L.S., Fellow of Trinity College, Cambridge. (With 
Plates XXXVII, XXXVIII and XXXIX) 
On the Ancestral Development of the Respiratory Organs in the 
Decapodous Crustacea. By Florence Buchanan. A Paper 
read to the Biological Society of University College, London. 
(With Plate XL) 
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