364 Journal of the Asiatic Society of Bengal. [Aug.-Sept., 1913. 
in both directions, part passing northwards past Byikhwaaw 
Bay, thus causing the fall and subsequent rise in the salinity 
curve, and part passing to the south causing the fall in the 
salinity of the sea-water in Port Owen and the region between 
it and the mainland. 
Esterly (1912, p. 294) has, as a result of his experiences in 
the iego region, come to the conclusion that salinity is a 
negligible factor in the distribution of the surface Copepoda, but 
in his observations the range of variation was only from 33-604 
to 33:649, whereas in the present case it varied from 30-618 to 
31°424 at the mouth of Tavoy River and from 30°112 to 31-200 
at Port Owen, and it would seem probable that Esterly’s 
Hu. 4 
HI, 
ei ontewuas mend 
Fig. 6. 
— to obtain any definite results was due to the fact that 
e 7 anges in salinity observed by him were too small. 
n addition to this tidal] variation it was found that 
a 
b Cope f i 
coaabdlanias Pred str requenting the surface showed very 
Hees obtained. 
ound that there was a decided tendenc 
: y for the total plankton 
and the Copepoda to rise to a maximum and then fall to a 
prings) or the phases of 
ble to correlate them with 
