280 
Transactions of the Society. 
Name of Creature. ] 
Nature of 
Dimension. 
Brain. 
Whole 
Crea- 
ture. 
'Proportion 
of Linear 
Approximate Volume 
Approximate 
Proportion of ■ 
Volume of Brain i 
to that of Whole ; 
Creature. 
Measurement 
of Brain to 
that of Whole 
Creature. 
Of Brain. 
Of Whole 
Creature. 
per cent. 
per cent. 
pheus latus 
length 
•09 
1*10 
8-18 j 
I 
5) * 
breadth 
•10 
•77 
13*00 
•0008511 
•2627 
1 
308-6 = 
•32 

depth 
•21 
•55 
38*18 J 
iosoma palmacinctum . . 
rO 
length 
•06 
•92 
6-52 1 
i 
55 55 •• 
o 
breadth 
•11 
•65 
16*92 
•0005979 
•1693 
1 
283-3 = 
•35 | 
5. >» --i 
depth 
•19 
•52 
36-65 j 
ycipliagus platygaster $ 
length 
•12 
*75 
I 16-00 \ 
(Tyroglyphidse) 
J 
1 
» » 
breadth 
•09 
*65 
13*85 | 
•0001772 
•9115 
514-4 = 
•19 
jj » 
•• 
depth 
* 03 
•30 
10-00 J 
imasus terribilis $ .. 1 
length 
•35 
. 1-65 
21 * 2 i 1 
1 
i >» 
s 
breadth 
• 2 C 
1-00 
26-00 | 
•001 
•6175 
1 
6 i T 75 = 
1-61 
55 55 * * 
rs 
depth 
i -31 
•57 
54-39 J 
jus togcdus 
1 1 
a 
! length 
•iG 
•90 
17*77 ) 
1 
55 55 
O 
breadth 
•12 
1 -40 
30-00 | 
•0006484 
•065 
100-25 = 
- 1 
5) » i 
| depth 
•09 
•22 
40-91 J 
ombidium sp. ? 
length 
•25 
to 
►i* 
o 
10-42 \ 
(probably holosericium ) 
1 
1 
5’ - * • • • • 
j breadth 
•15 
•82 
18-29 f 
•002488 
1-2495 
502-2 = 
•2 
a 
1 depth 
•18 
•85 
21-18 j 
vyas petrophilus . . 
length 
•11 
1-10 
10*00 \ 
(Hydrachuidse) 
1 
1 
>5 55 • * 
breadth 
•10 
•67 
14-93 | 
•0004605 
•18915 
410 7 = 
•24 
„ ,, .... 
depth 
•12 
•40 
30-00 j 
\eyletus Jlabellifer 
length 
•07 
•52 
13-46 } 
] 
?> 5) 
breadth 
•07 i 
•28 
25-00 ! 
•00008776 
•01689 
192-4 = 
•52 
55 55 
•• 
depth 
•05 
•17 
29-41 J 
tranychus lintearius ? 
length 
•10 
•42 
23-81 ] 
1 
„ „ 
breadth 
•07 
•22 
31-81 | 
•0001362 
•009125 
67 “ 
1-5 
» » •• 
■■ 
depth 
•05 
•15 
33-33 J 
All the measurements in this table are in decimals of a millimetre. 
