On the co-existence of ovigerous and spermatic capsules on the same individuals of the hydra viridis / by Allen Thomson.
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On the co-existence of ovigerous and spermatic capsules on the same individuals of the hydra viridis / by Allen Thomson. Credit: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.. Public Domain Mark