BOTTOM FAUNA OF BLACKWATER ESTUARY: 1970 265
Fig. 2. Distribution of a number of Blackwater species. A—those re-
stricted to the Thirslet region. B—mid-channel species. C—
Nephthys caeca. D—offshore species, + marks the Blackwater
record of Psammechinus miliaris, * that of Alcyonium digitatum.
See text.