CONTENTS. 



j^ L — Report on the Echinoidea dredged by H.M.S. Challenger, during the years 



1873-1876. 



By Alexander Agassiz. 



{Received Septemher 1, 1880.) 



-/- II. — Report on the Pycnogonida dredged by H.M.S. Challenger, during the years 



1873-1876. 



By Dr P. P. C. Hoek, A.ssistant at the Zootomical Laboratory of Leiden LTniversity. 



{Received Fehruanj 20, 1881.) 



190U 



