. Bulletin of the British Museum (Natural History). THE DISTRIBUTION OF PELAGIC POLYCHAETES 393 Specimens of V. longissima from five localities, Trans-Pacific Exp., Stns. 51A, 54A, and 56A, and Hugh M. Smith Cruise 30, Stns. 74 and 96 have irregular black spots on the eyes and surrounding areas. Stn. 51A is from the Transition Zone, and the other four stations are from close to the boundary separating it from the Sub-Tropical Zonei and although these records are few the presence of specimens with this unusual character (the first time it has been recorded) in and near the O Fig. 8. Vanad
. Bulletin of the British Museum (Natural History). THE DISTRIBUTION OF PELAGIC POLYCHAETES 393 Specimens of V. longissima from five localities, Trans-Pacific Exp., Stns. 51A, 54A, and 56A, and Hugh M. Smith Cruise 30, Stns. 74 and 96 have irregular black spots on the eyes and surrounding areas. Stn. 51A is from the Transition Zone, and the other four stations are from close to the boundary separating it from the Sub-Tropical Zonei and although these records are few the presence of specimens with this unusual character (the first time it has been recorded) in and near the O Fig. 8. Vanadis longissima : dorsal view of head and extruded proboscis, showing marking on the eyes ; specimen from Stn. 74, of Hugh M. Smith Cruise 30. I Transition Zone should be noted as possibly indicative of a distinct population inhabiting this region. It is shown below, p. 442, that the northern boundarv of the Transition Zone is the northerly limit of the distribution of V. longissima in the North Pacific and it is of interest that at its southern hmit in the South Atlantic at the Antarctic Convergence it meets the endemic antarctic form Vanadis antarctica which it was suggested in Tebble (i960), may be a geographical race rather than a separate species. This suggestion may now be taken a little further. It is possible that, at the extremities of its range in higher latitudes, V. longissima has developed, or IS developing, separate populations capable of establishing themselves in dis- 1 Specimens of F. longissima from Trans-Pacific Stns. 70E. 76A and H. M. Smith Cruise 30, Stn. 29 also near this boundary, are without heads. '^ 3 , -J'-"- 'V. 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 British Museum (Natural History). London : BM(NH)
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