A considerably higher concentration than those previously recorded prevails in the Tongue of the Ocean, a deep"fjord" in the shallow Great Bahama Bank. This is evidenced, partly by a photograph taken from D.S.R.V. "Alvin at 2375 m depth(Fig. 6i), partly by da:a which were kindly supplied by Dr. G. T. Rowe: Several thousand photographs taken from the''Alvin'' along a transect of the Tongue for the amount of seagrass on the bottom were analyzed by P. Polloni and N. Staresinic The total area surveyed was 904 m2, and no less than 11.3 m' or 1.2% of the bottom proved to be covered with a layer of detrital Thalassia. The quantities dredged by the"Pilisbury" and the"Akad. Kur- chatov" are recorded in Table 1(p. 202). The former vessel used a 41- foot otter trawl, usually working for 4 hours at depths greater than 4500 m and for 2 hours at shallower depths. The hauls of the"Kurchatov" with a 3-m sledge trawl lasted about one hour. However, the speed over the bottom is not known, and it is also uncertain whether the trawl was actually on the bottom during the whole period. Thus, the quantities por station are not easily comparable.