A MOIS ^GRAPH 



GYMNOBLASTIC OR TUBULARIAN 



HYDROIDS. 



GEORGE JAMES ALLMAN, M.D. 



DUBLIN AND OXON., 



FELLOW OF THE UOYAL COLLEGE OF SUBGEONS IX IRELAND, F.R.S., F.R.S.E., JI.H.T.A., F.L.S., C.M.Z.S. 



EMERITUS REGIUS PROFESSOR OF NATURAL HISTORY IN THE ISIVERSITY 



OF EDINBURGH. 



TCS^eLUSION OP PAET I, 



AND 



PART II, CONTAINING DESCRIPTIONS OF THE GENERA AND 

 SPECIES OP THE GYMNOBLASTEA. 



LONDON : 



PUBLISHED FOR THE BAY SOCIETY BY 



ROBERT HARDWICKE, 192, PICCADILLY. 



MBCCCLXXII. 



In/A] . 



