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Biol Bull 99: 74-87. (August 1950)
© 1950 Marine Biological Laboratory
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A TWO-TENTACLED, COMMENSAL HYDROID FROM CALIFORNIA (LIMNOMEDUSAE, PROBOSCIDACTYLA)

CADET HAND 1 and JOHN R. HENDRICKSON 2

1 Department of Zoology, Mills College, Oakland, California and Department of Zoology, University of California, Berkeley
2 Department of Zoology, University of California, Berkeley

1. The history of the Proboscidactylidae is summarized and changes are suggested in the definition of the family.

2. A new Californian hydroid is described as Proboscidactyla sp. This hydroid may be that of Proboscidactyla occidentalis Fewkes.

3. The new hydroid lives as a commensal upon the tubes of a sabellid polychaete, Pseudopotamilla ocellata Moore.

4. The commensal relations of the hydroid to the host worm are described, especially the utilization by the hydroid of the feeding currents produced by the worm.

5. The relationship of Proboscidactyla to Monobrachium parasitum is discussed.






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