

THE 



OCEANIC H Y D R Z OA; 



A DESCKIPTION OP THE 



CALYCOPHORID.E AND PHYSOPHORID.E 



OBSERVED DURING THE VOYAGE OF H.M.S. "RATTLESNAKE/ 



IN THE YEARS 1846-1850. 



WITH A GENERAL INTRODUCTION. 



BY 



THOMAS HENRY HUXLEY, E.R.S., F.L.S., SEC. G.S.; 



ACAD. IMP. LEOP. CAR. NAT. CUR.; PROFESSOR OF NATURAL IJISTOKV, 

 GOVERNMENT SCHOOL OF MINES. 



LONDON : 



PRINTED FOE T.HE RAT SOCIETY. 



MDCCCLIS. 



