CONTENTS. 



I. — Report on the Anatomy of the Petrels (Tubinares) collected during the 

 Voyage of H.M.S. Challenger, in the years 1873-1876. 



By W. A. Forbes, B.A., F.L.S., F.G.S., M.B.O.U., Fellow of St. John's College, 

 Cambridge, Prosector to the Zoological Society of London. 



(Received May 6, 1882.) 



II. — Report on the Deep-Sea Medusa dredged by H.M.S. Challenger, 



during the years 1873-1876. 



By Professor Ernst Haeckel, M.D. , Ph.D. 

 (Received March 1, 1881.) 



III. — Report on the Holothurioidea, dredged by H.M.S. Challenger during 



the years 1873-1876. Part I. 



By Hjalmar Theel. 

 (Received June 1, 1881.) 



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