358 Journal of the Asiatic Society of Bengal. [Aug.-Sept., 1913. 
under investigation than in the more northerly region around 
the mouth of Tavoy River. A study of the various results ob- 
tained round Port Owen, Fisher Bay (13:06 N: 98:19 E.), 
also shows that the plankton decidedly increases from early in 
November to the end of December, and beginning of January 
and then once more diminishes. 
In the accompanying tables (Appendix, II and III) I have 
indicated the presence or absence of most I 
stituents of the plankton in the various hauls, and below 
append a few notes on certain animals that appear worthy of 
further notice :— 
belong to the genus Citharichthys, and very closely resembles 
the C. aureus, Day. (1889, p. 440, fig. 156). It is not identical, 
however, with this species, and a full account will, it is hoped, 
be published shortly. 
wo young examples of a species of Monacanthus were 
obtained at Station 443. In both the whole body and head 
occurrence of large 
been observed by Jenkins (1912, p. 51). 
CEPHALOCHORDA. 
Amphioxides valdiviae.—A single example of an Amphioxides 
larva was obtained at station 399, 
In length it measured ot 0  OOE mm: 
Proportion of length to breadth ~« 1136 
Proportion of post-anal length to total length 7-13 
There are twenty gill clefts present, and the mouth extends 
back to the level of the 8th gill bar. The end of the gill region 
