Land and fresh water mollusks / by William H. Dall. Hydroids / C.C. Nutting.

The hydroid obelia geniculatus and its calcium activated protein.

Ueber Cordylophora lacustris / von W. Dönitz.

Hydroids.

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Hydrozoa

Works from the collections

Land and fresh water mollusks / by William H. Dall. Hydroids / C.C. Nutting.

The hydroid obelia geniculatus and its calcium activated protein.

Ueber Cordylophora lacustris / von W. Dönitz.

Hydroids.