236
HILdRY B. MOORE
tropics are the ones which can range into cooler waters, while those
which have slow tropical growth are limited to those waters.
Although only the bivalves are adequately represented, it is
possible to group together the entire data for each of the other groups
8
7
6
.- , 5
6 4
e
f
3
2
I
0
0
0
0
0
0
0
0
0
0
O O
0
0
0
0
0
0
0
l as
0
0
0 -
1
1 0
20
30
Temperature - '
C
FIQ. 16. Relation of temperature-oorreoted growth rate to the aanual mean temperature
of the looality in bivalves.
and make some significant comparisons. For each group we calculated
the regression of growth rate on temperature, using only the 1ocaIities
below 25OC except in the case of the urchins. Data here were too scanty
to allow anything to be discarded. Using these regressions we calculated, for each group, what the rate would have been at a standard