Pelagic Tunica ta — B ary 
107 
TABLE 4 
Widths of M2 to M8 Expressed as Percentage of Total Muscle Width in 
"Old Nurses” from New Zealand 
LENGTH OF 
SPECIMEN 
TOTAL 
MUSCLE 
WIDTH OF MUSCLES AS PERCENTAGES OF TOTAL MUSCLE 
mm . 
mm . 
M2 
M3 
M4 
M5 
M6 
M7 
M8 
9.8 
7.3 
12.3 
19-2 
17.8 
15.1 
13.7 
12.3 
9.6 
10.0 
9-9 
12.7 
17.9 
18.9 
15.2 
13.8 
11.4 
10.1 
10.5 
7.7 
14.3 
18.2 
16.9 
15.6 
15.6 
11.6 
7.8 
10.6 
6.9 
14.5 
17.4 
17.4 
15.8 
14.5 
13.1 
7.3 
11.0 
8.1 
12.3 
19.9 
18.6 
16.1 
13.3 
12.3 
7.5 
12.0 
9.7 
14.5 
20.6 
18.5 
13.4 
12.4 
11.4 
9.2 
13.5 
11.5 
16.5 
17.3 
17.4 
15.7 
13.9 
10.5 
8.7 
13.8 
12.1 
14.8 
19.0 
16.5 
15.7 
13.2 
12.5 
8.3 
15.4 
13.6 
13.8 
21.3 
16.8 
14.6 
13.8 
12.4 
7.3 
17.5 
12.0 
15.8 
17.5 
17.5 
15.9 
12.5 
12.5 
8.3 
21.0 
17.7 
13.0 
19.3 
17.7 
16.5 
15.3 
11.9 
6.3 
22.0 
16.4 
13.4 
18.3 
18.3 
14.0 
14.0 
12.2 
9.8 
23.0 
17.4 
13.8 
17.2 
17.1 
16.7 
14.4 
14.4 
6.4 
28.0 
18.6 
14.7 
16.7 
17.6 
16.4 
14.6 
13.4 
6.6 
29.0 
15.75 
14.5 
18.4 
18.5 
14.5 
13.5 
12.9 
7.7 
33.5 
24.05 
12.6 
19.6 
17.1 
15.9 
14.7 
12.6 
7.5 
Averages 
14.0 
18.6 
17.7 
15.4 
14.0 
12.3 
8.0 
for specimens from all areas sampled, including 
New Zealand. 
Old nurse stages (Fig. 8) occurred in the 
present material along with the gonozooids and 
phorozooids of Dol. valdiviae. Application of 
Garstang’s method to specimens indicates there 
is affinity to the t( gegenbauri type.” Consistent 
differences from his material were evident, how- 
ever, in the percentage widths of M.2, and M.6 
to M.8, relative to the widths of M.3 and M.4, 
see Tables 4 and 5. Table 4 presents data from 
Lachlan material, and Table 5, from Garstang, 
for D. gegenbauri. As M.l and M.9 were dif- 
ficult to measure accurately because of variability 
in the state of contraction, and also were fre- 
quently damaged, they are omitted. The omis- 
sion is scarcely significant, amounting in all to 
some 2-3 per cent (Garstang, p. 234), and does 
not account for the differences between the two 
groups of specimens. 
In Lachlan material, M.2 averages 3.7 higher 
than in D. gegenbauri, M.3 and M.4 are respec- 
tively 1.0 and 0.7 lower, M.5 about the same, 
M.6 somewhat lower, but M.7 shows an increase 
of 1.2 and M.8 an increase of 2.4. Thus the 
New Zealand specimens are distinguishable by 
the greater proportional widths of M.2, M.7 and 
M.8 relative to M.3 and M.4. 
TABLE 5 
Widths of Individual Muscles as a Percentage of Total Muscle Width, for 
"Old Nurses” of D. gegenbauri (from Garstang) 
LENGTH 
MUSCLE 
WIDTH OF MUSCLES AS PERCENTAGES OF TOTAL MUSCLES 
mm . 
mm . 
Ml 
3 - 9 
— 
4.0 
2 - 6 
— 
1.8 
6-18 
— 
2.7 
6 - 7 
5.1 
2.6 
9-15 
10.3 
2.8 
17-18 
14.7 
2.5 
2.7 
M2 
M3 
M4 
M5 
9.6 
18.1 
17.8 
15.2 
9.9 
18.3 
18.3 
16.2 
10.6 
20.3 
18.6 
15.1 
10.5 
19.7 
18.3 
15.1 
10.8 
20.6 
18.5 
15.1 
10.7 
20.5 
18.9 
15.1 
10.3 
19.6 
18.4 
15.3 
M6 
M7 
M8 
M9 
14.2 
11.2 
6.3 
3.4 
14.9 
12.0 
6.2 
2.4 
14.1 
10.7 
5.2 
2.8 
13.8 
11.4 
5.6 
3.0 
14.1 
10.4 
5.2 
2.7 
14.2 
10.7 
4.7 
2.6 
14.2 
11.1 
5.6 
2.8 
Averages 
