CONTENTS. 



I. — Report on the Monaxonida collected by H.M.S. Challenger during the years 



1873-1876. 



By Stuart 0. Ridley, M.A., F.L.S., late Assistant in the Zoological Department of the 

 British Museum, and Arthur Dendy, B.Sc, F.L.S., Assistant in the Zoological 

 Department of the British Museum. 



{The Alanuscrijit loas received in Instalments hetiveen 19 th November 1886 



and I3th May 1887.) 



II. — Report on the Myzostomida (Supplement) collected by H.M.S. Challenger 



during the years 1873-1876. 



By Dr. L. von Graff, Professor in the University of Graz, Austria. 

 (The Manuscript loas received on 10th March 1887.) 



III. — Report on Cephalodiscus dodecalophus, a new type of the Polyzoa, procured on 

 tlie Voyage of H.M.S. Challenger during the years 1873-1876. 



By William C. M'Intosh, M.D., LL.D., F.R.S., &c.. Professor in the 

 University of St. Andrews. 



{The Manuscript ivas received in Instalments between 25th April 1887 



and 19th May 1887.) 



790^)2 



