A MONOGEAPH 



OF THE 



GYMNOBLASTIC OR TUBULARIAN 



HYDROIDS. 



IN TWO PARTS. 



T.-THE HYDROIDA IN GENERAL. 

 II.-THE GENERA AND SPECIES OF THE GYMNOBLASTEA. 



GEORGE JAMES ALLMAN, M.D. 



DUBLIN AND OXON., 



KELLOW OF THE EOYAL COLLEGE OP SURGEONS IN IKELAND, F.E.S., F.ll.S.E., M.K.I. A., ETC.; EJIEKITUS 

 PROFESSOR OP NATURAL HISTORY IN THE UNIVERSITY OF EDINBURGH. 



LONDON: 



PUBLISHED FOR THE RAY SOCIETY BY 



ROBERT HARDWICKE, 192, PICCADILLY. 



imcccLxxi. 



