No. 394.] HYDROID FROM LONG ISLAND SOUND. 807 
bear usually about twenty tentacles, arranged in a single circle. 
The reproductive hydranths are slightly smaller and bear 
usually six to ten tentacles and four or five reproductive buds. 
Medusa becoming free, though degenerate, the sexual products 
mature when the medusa is liberated. Medusa with four radial 
canals; eight equal rudimentary tentacles ; mouth opening and 
mouth parts absent; velum developed. 
UNIVERSITY OF MINNESOTA, 
August 21, 1899. 
