Variation in Form, Orientation and Mode of Attachment of the Cirriped, Octolasmis stella (Ann.), Symbiotic on the Gills of Lobster

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Abstract
Examination of a large amount of material of Octolasmis stella, found on the gills of deep-sea lobster, Puerulus sewelli Ramadan, revealed interesting variations in the form and arrangement of the capitular valves those cirripeds growing around the base of the gill rachis have stouter valves set close to each other, while those affixed to the apical regions of the gill have delicate valves arranged around the periphery of the capitulum. The difference in the degree of shell armament of cirripeds located in different regions of the gill has been interpreted as due to differences in the degree of protection afforded by the host. Cirripeds are also orientated positively to the host''s respiratory currents, and this has been shown to be a direct result of the cyprids, many of which were collected and observed in situ on the gill, attaching themselves in such a way as to bring the future apertural margin and the cirral net to face the current.

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