( 16 
been. From these comparative mean measurements a curve 
can be constructed to show the relation of x (the weight in 
grammes) to \j (the measurement of the short cliiimoter in mm.). 
This curve is shown in Fig. 3. From these results I was able 
^x — 45\ 
I which is a close 
to derive a formula* y — 98 = 90 
\x-VVz'o/ 
approximation of the actual results. ]Mr. A. J. Bamford, 
the Superintendent of the Colombo Observatory, suggests 
another formula , which gives a slightly closer approximation 
than my own. This formula is x — 0'0052 
practical purposes x = — I I 
"i:^^ 
1^ or for 
Edation between Short Diameter and Long Diameter. 
The measurements have been further analysed to show 
the relation between short diameter and long diameter. 
These are given in Appendix VII., and the results are as 
follows : — 
Short Dia- 
meter, 
mna. 
15 
25 
35 
45 
55 
65 
75 
92' 
97' 
102 
107 
jong 
Dia- 
Short Dia- 
meter. 
meter. 
mm. 
mm. 
17 
57 
112-5 
27 
26 
117-5 
40 
07 
122-5 
48 
81 
127-5 
58 
80 
132-5 
70 
50 
137-5 
81 
40 
142-5 
92 
30 
147-5 
99 
88 
152-5 
104 
16 
157-5 
109 
70 
162-5 
115 
85 
167-5 
Long Dia- 
mete 
r. 
mm 
121 
03 
126 
26 
130 
78 
134 
72 
139 
92 
144 
76 
149 
18 
154 
00 
158 
28 
163 
12 
167 
27 
175 
20 
* The formulae given here differ slightly from those given by me in my 
Administration Report (Marine Biology) for 1920-21 for the reasons 
indicated above. 
