au Hlemoirs of the Museum of Comparative Zoology 
aA vA x AT HARVARD COLLEGE. 
Worms Vv. No: 2! 
1e@9/ 
“ZN: Vi & 
REPORT 
ON THE 
HY DROIDA 
COLLECTED DURING THE EXPLORATION OF THE GULF STREAM BY L. F. Dr POURTALES, 
ASSISTANT UNITED STATES COAST SURVEY. 
[PUBLISHED BY PERMISSION OF PROFESSOR BENJAMIN PEIRCE, SUPERINTENDENT U. 8. Coast SuRVEyY.] 
BY 
GEO. J. ALLMAN, M.D., LL.D., F.B.S., M.R.LA, Cor.M.Z.S.L., F.R.C.S.L, 
PRESIDENT OF THE LINNEAN SOCIETY, MEMBER OF THE ROYAL DANISH ACADEMY OF SCIENCES, 
EMERITUS REGIUS PROFESSOR OF NATURAL HISTORY IN THE 
UNIVERSITY OF EDINBURGH, 
ETC. 
WITH THIRTY-FOUR PLATES. 
Cron Bebe ie 
CAMBRIDGE: 
WELCH, BIGELOW, AND COMPANY, 
Gniversity WBress, 
Wee fe 
