This encrusting organism was identified as a Kamptozoan, Barentsia benedeni.

Water quality on 9-20-2017 –SERC probe YSI 2030
Water temperature
21.4 degC top 21.4 degC bot
Salinity 29.7 ppt top, 29.7 ppt 1 m
Dissolved oxygen
7 ppm top, 6.4 ppm bot
Depth 1.5 m
Secchi 1.25 m