Vol. IX, Nos. 8-9.] Biological Work of the Investigator.’? 357 
[V.S8.] 
Length of body—34 inches. 
»> 4, Seta,—5i inches. 
No. of segments—43. 
Unfortunately the tube containing the surface collection 
was broken in transit and its contents lost. 
OBSERVATIONS ON THE SURFACE PLANKTON. 
During both years a large number of collections of the 
surface-plankton were made at different stations: in the first 
Survey-season 1910-11 numerous tow-nettings were taken in the 
region of the coast from the Middle Moscos Islands to Tavoy 
Point, and during the second year 1911-12, a further series of 
collections was made at stations extending from Tavoy Point 
to the north end of Iron Island. 
In addition to these, tow-nettings were also taken of the 
plankton at the mouth of Rangoon River (station 394) in 
Hinzé Basin and at stations 393, 395 and 396, where bottom 
trawls were also made. 
The results obtained in the more northerly region as 
regards the occurrence and distribution of the diatom flora and 
Copepoda have already been published. (Sewell. 1912 (b), 
. 349.) pat 
I have there shown that in this region the plankton exhibits 
a regular banded arrangement, so that the region can be 
divided up into four areas: in the more southerly region from 
Tavoy Point to Iron Island there was no indication of any such 
division, the planktonic distribution being uniform throughout 
the whole area. Here the diatoms present were or the most 
but as they were found equally numerous at 
widely-distant stations and at stations where on previous visits 
h 
tions are not sufficiently numerous for the results to be pad 
sive, yet they indicate that the surface plankton was, on the 
whole, more abundant towards the southern end of the area 
