Vol. IX, Nos. 8-9.1 Biological Work of the ‘‘ Investigator.’’ 359 
[N.S.] 
is at the level of myotome 24; while the anal opening is at the 
level of myotome 54, and there are twelve post-anal myotomes. 
There are about five fin ray boxes present to every myomere 
throughout the whole length of the animal. 
From the above characters, it would appear that this must 
be an example of A. valdiviae. 
TunicaTa.—The two commonest forms of surface-frequent 
ing tunicates were Salpa cylindrica, Cuv. and Salpa democratica 
Forsk. 
on one occasion as many as 500 were obtained in a single haul. 
They were invariably individuals of the ‘‘ solitary ? type, 
and in the majority of cases possessed a well-marked stolon, 
with a chain of developing young. The examples of S. demo- 
cratica were small, measuring from 6—7 mm. in length. 
CRUSTACEA. 
oda.—Numerous examples of Lucifer were obtained 
in the surface trawls: they all appear to belong to a single 
species, L. typus, Auct.: during the months of March and 
ing from its appearance had 
of Ot a. These females were usually accompanied by 
numerous young that were clinging to the sides of the barrel 
ope —The various species of Copep da obtained 
Point have already been determined and an account of them 
published. (Sewell, 1912 (b)). In the more southerly region 
from Tavoy Point to the north of Iron Islan, she van) 
were obtained, so that it is unnecessary to give any further 
account of them eason 1910-11, a 
During the latter part of the survey Seas ( é 
; ith a view to investi- 
I n camp ashore. 
The results of these investigations have been worked out — 
are given below. Table LV are sempre’ the results derive 
from a series of tow-nettings taken while 
soundings. I have made no attempt to calculate the numbers 
of Copepoda present per cubic-area of water, Q 
disposal was not sufficient ; I have instead reduced see caved 
to the number caught per hour, and, as, in all cases, the 
