In a photographic survey of the Virgin Islands Basin, Roper and dage(1972) observed seagrass remnants in nearly every one of about 5300 bottom photographs from an average depth of 3900 types of long, thin, grasslike fragments were noticed, the most common being mm in average width, and the other, which occurred in much smaller 1.5 numbers, being 6-12 mm wide. The former were identified as manatee grass, Syringodium filiforme, and the latter as turtle grass, festudinum. A number of photos from the Blake Basin(average depth 5000 m) show single Thalassia blades(Roper and Brundage, 1972) seagrass blades appeared on five photos from trenches in the west and southwest Pacific(Lemche et al., 1976); they were particularly abundant in the Palau Trench(c. 1 per 30 m2).