Fourty-four species and one variety of hydroids were identified in the John Murray hydroid collection, obtained from the Gulf of Aden, the Arabian Sea and the northern part of the Indian Ocean, largely from deep water localities. Of these 44 species 2 could be identified only to genus, 1 species is doubtfully mentioned and 5 are new to science. The 44 species we assigned to 2 families of athecate and 6 families of thecate hydroids. In many instances the species have been compared with the type material which, where necessary, was redescribed. A number of additional species, not represented in the John Murray collection has also been redescribed and/or figured. Practically all the John Murray hydroids are figured. Deposition of spirit-preserved type and other material (alc.), including microslide preparations (slds) in the collections of the British Museum (Natural History) (BMNH) and in the collections of the Rijksmuseum van Natuurlijke Historie (National Museum of Natural History), Leiden, Netherlands (RMNH), is indicated. Holotypes, and where necessary paratypes, have been indicated of Zygophylax millardae sp. nov., Zygophylax tottoni sp. nov., Sertularella whitei sp. nov., Cladocarpus indicus sp. nov., and Cladocarpus sewelli sp. nov. Holotype and paratype material of all these species has been deposited in the BMNH collections, Department of Zoology; schizoholotypes and some of the paratypes have been placed in the Coelenterate collection of the RMNH.

Zoologische Verhandelingen

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Naturalis journals & series

Rees, W. J., & Vervoort, W. (1987). Hydroids from the John Murray Expedtion to the Indian Ocean, with revisory notes on Hydrodendron, Abietinella, Cryptolaria and Zygophylax (Cnidaria: Hydrozoa). Zoologische Verhandelingen, 237(1), 1–209.