1. Oceanlab; University of Aberdeen; Aberdeen; AB41 6AA; UK
2. Department of Invertebrate Zoology; Smithsonian Institution; National Museum of Natural History; Washington; DC; 20560; USA
3. P. P. Shirshov Institute of Oceanology; Russian Academy of Sciences; Moscow; 117997; Russia
4. National Oceanography Centre; Southampton; Hampshire; SO14 3ZH; UK
5. Rosemary Cottage; Rosemary Lane; Musbury; Axminster; Devon; EX13 8AS; UK
6. Division of Marine Biology; Scripps Institution of Oceanography; La Jolla; California; 92093-0202; USA