80 
Proceedings of the Royal Society of Edinburgh. [Sess. 
September 27, 10 to 11 a.m. 
Air, 12° ’6 C. ; water, 12°*0 C. ; 8 starfishes and 6 sea-urchins examined. 
Number. 
Temperature. 
Difference. 
Starfishes 8 
12°0 C. 
0 ? 0C. 
Sea- f 4 
12-0 
o-o 
urchins \ 2 
12T 
0T 
6 
Mean, 12 ‘03 
0-03 
September 27, 2 to 3 p.m. 
Air, ; water, 12°*1 C. ; 16 sea-urchins examined. 
Number. 
Temperature. 
Difference. 
11 
12T C. 
0 ? 0 C. 
3 
12-2 
0T 
2 
12*3 
0-2 
16 
Mean, 12T4 
0-04 
Difference between Temperature of Animal and of Water. 
Shore Crab. 
Edible Crab. 
Lobster. 
Sea-urchin. 
Starfish. 
0°0 C. in 43 individuals 
0*0 C. in 13 indiv. 
0*1 C. in 
1 indiv. 
0*0 C. in 34 indiv. 
0*0 C. in 
8 indiv. 
0-1 „ 12 
0*1 „ 11 „ 
0*1 „ 9 „ 
* . . 
0-2 „ 4 
0*2 „ 11 „ 
0*3 „ 5 „ 
0-2 „ 2 „ 
Mean, 0*034 „ 59 „ 
o 
GO 
6 
0*029 „ 45 „ 
It will be seen at a glance, from an inspection of the above analysis, 
that in each of the species, with the exception of the lobster, both from 
the Crustacea and the echinodermata the temperature of the animal is 
the same as that of the water in which it has lived, in the great majority 
of cases. The mean difference, however, is greater in the crustaceans 
than in the echinoderms; that is to say, a larger proportion of those 
examined had an appreciable temperature. This is most evident in the 
edible crab, and here also the highest temperature was recorded, viz. 0°*3 C. 
This crab is not so active nor so quick in its movements as the smaller 
