332 Journal of the Asiatic Society of Bengal. [Aug.-Sept., 1913. 
During the remainder of the season, however, the series of 
observations on the plankton were continued by my assistant 
Mr. J. Howard, 1.8.M.D., and several mid-water and bottom 
trawls were made during the run back to Bombay in April, and 
the results were preserved and forwarded by him to Calcutta. 
During both seasons 1910-11 and 1911-12 the R.I.M.S.S. 
‘* Investigator ’’ was occupied in surveying the Tenasserim 
coast. 
Roughly speaking the area in which biological investi- 
gations were carried out extends from Hinzé Basin to Tavo 
Point in 1910-11, and from Tavoy Point to the north end of 
Thamila or Iron Island in 1911-12. 
_ These two areas present very considerable differences in 
the general topography of the coast line: in the northern area, 
the coast consists almost entirely of a series of rocky cliffs and 
promontories, interspersed with long stretches of clean sand that 
two areas is to be found in the Tavoy River; this brings down 
1912, p. $50.) 
One of the chief characteristics of the coast is the complete 
a of any beds of ‘‘ weed’’ or algae. Petersen (1911, 
According to Petersen, much of the organic food supply in the 
sea is produced by the breaking down of the tissues of these 
