TY  - GEN
AU  - Hyman,Libbie H.
TI  - Taxonomic studies on the hydras of North America: III. Rediscovery of Hydra carnea L. Agassiz (1850) with a description of its characters 
PY  - 1931///
CY  - [S.l.
PB  - s.n.]
N1  - Tav. di studio SZN
ER  -