. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 51 those described by Stasek (1965) for Yoldia ensifera. The ciliation on the frontal surface of the gill plates is axially directed, there those on the posterior 2/3rds of the axis move anteriorly and those on the anterior l/3rd move poste- riorly. Particles thus accumulate at a point which is close to where the palp proboscides join the dorsal palp surface and they are accepted onto the palp. The palp ridges sort in the manner described by Stasek (1965). Rejected particles arrive at the posterior-ventral marg
. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 51 those described by Stasek (1965) for Yoldia ensifera. The ciliation on the frontal surface of the gill plates is axially directed, there those on the posterior 2/3rds of the axis move anteriorly and those on the anterior l/3rd move poste- riorly. Particles thus accumulate at a point which is close to where the palp proboscides join the dorsal palp surface and they are accepted onto the palp. The palp ridges sort in the manner described by Stasek (1965). Rejected particles arrive at the posterior-ventral margin of the palp. A main rejection tract at the mantle edge to the inside of the muscular fold carries these particles to a point of collection at the ventral edge of the feeding aperture. Particles on the body eventually pass to the dorsal margin of the palps and join with those from the gills. Hydroids were present on the shell margins of a number of specimens. Yoldiella perplexa (new species) Type locality. Knorr Sta. 299, Guyana Basin, ! , 7°'N, 54°'W, Epibenthic Trawl, 1912-2076 m. Type specimen. Holotype BM(NH) 1992031, Paratypes: in collection held by J. A. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Natural History Museum (London). Andover : Intercept
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