1891-92.] A. B. Griffiths on the Blood of the Invertebrata. 129 
The above figures represent volumes of the* gases per 100 volumes 
of blood (the gaseous volumes being reduced to 0° C. and 760 mm.). 
The blood of these Molluscs readily coagulates, forming a gelatin- 
ous coagulum ; and this coagulum rapidly becomes fluid again. 
Similar observations have been made by Krukenberg on otlier 
Molluscs. 
The blood of Murex (a Branebiogasteropod) and Loligo (a 
Cepbalopod) has also been investigated by the author. In both 
of these animals it is a true hsemolymph containing the respiratory 
pigment — hsemocyanin ; and the following empirical formula has 
been recently assigned to baemocyanin :* — 
^ 867 ^^ 1363 ^ 223 ^^^^ 4 ^ 258 - 
The percentages of saline matter contained in the blood of Murex 
and Loligo are given in the following table ; — 
i 
I. 
1 II. 
III. 
Average. 
^ Murex, .... 
1-826 
1-820 
1-818 
1-821 
j Loligo, .... 
3-216 
3-201 
3-208 
3-208 
Analyses of the ashes of the blood of these two Molluscs gave the 
following results (average of two analyses in each case) : — ■ 
Murex. 
Loligo. 
Copper oxide ,(CuO), 
0-24 
0-21 
Lime (CaO), . . . 
3-71 1 
2-32 
Magnesia (MgO), .... 
1-82 
1-54 
Potash (KgO), 
4-86 1 
4-90 
Soda (Na^O), ..... 
44-26 j 
45-23 
Phosphoric acid (PgOg), . 
4-53 
4-80 
Sulphuric acid (SOg), 
2-66 
2-84 
Chlorine, 
37-92 
38-16 
100-00 
100-00 
i 
The blood of these animals is rich in solid constituents, as the 
following table shows : — 
* Dr Griffiths in Comjjtes Rendus, t. cxiv. p, 496. 
VOL. XIX. 12/11/92 I 
