CONTENTS OF No. CI.-New Series. 



MEMOIRS: 



PAGE 



On the Relations of the Yolk to the Gastrula in Teleosteans, and in 

 other Vertebrate Types. By J. T. Cunningham, B.A., Fellow of 

 University College, Oxford ; Superintendent of the Scottish Marine 

 Station. (With Plates I, II, III, and IV) . . . .1 



On the Structure and Function of the Sphseridia of the Echinoidea. 

 By Howard Ayeks, of Ann Arbor, Michigan, U.S. America. (With 

 Plate V) . 39 



The Nerve Terminations in the Cutaneous Epithelium of the Tadpole. 

 By A. B. Macalltjm, B.A., Fellow of University College, Toronto, 

 Canada. (With Plate VI) . . . . . .53 



On Green Oysters. By E. Ray Lankester, M.A., LL.D,, F.R.S., 

 Jodrell Professor of Zoology in University College, London. (With 

 Plate VII) . . " 71 



The System of Branchial Sense Organs and their Associated Ganglia 

 in Ichthyopsida. A Contribution to the Ancestral History of Ver- 

 tebrates. By John Beard, Ph.D., B.Sc, Berkeley Fellow of Owens 

 College, Victoria University, Manchester. (With Plates VIII, IX, 

 andX) . . . . . . . .95 



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