1891-92.] A. B. Griffiths on the Blood of the Invertebrata. 121 
The author has also submitted to analysis the ashes of the blood 
of these animals, and the preceding and following results represent 
the averages of two analyses in each case. 
Areni- 
cola. 
Aphro- 
dite. 
Glyeera. 
Tere- 
bella. 
Nereis. 
Iron oxide (Fe203), . 
0-20 
0-24 
0-22 
0-22 
0-23 
Lime (OaO), 
3-63 
3-21 
3-32 
3-64 
3-20 
Magnesia (MgO), 
1-25 
1-52 
1-55 
1-20 
1-50 
Potash (K^O), . . 
4-05 
5-06 
5-01 
4-08 
5-04 
Soda (NagO), . 
45-20 
44-32 
44-20 
45-21 
44-36 
Phosphoric acid (P 2 O 5 ), 
4-50 
4-80 
4-79 
4-56 
4-82 
Sulphuric acid (SO3), 
2-11 
2-81 
2-82 
2-00 
2-79 
Chlorine, .... 
39-06 
38-04 
38-09 
39-09 
38-06 
100-00 
100-00 
100-00 
100-00 
100-00 
These animals possess blood which is much richer in solid con- 
stituents than Echinoderms ; and the next table gives the composi- 
tion of the blood of the eleven Annelids investigated : — 
Sipuncu- 
lus. 
Hirudo. 
HmmopJi- 
sis. 
Lumhri- 
cus. 
Sabella. 
Serpula. 
Water, 
91-65 
90-75 
90-40 
90-12 
90-82 
91-22 
Solids, 
8-35 
9-25 
9-60 
9-88 
9-18 
8-78 
( Fibrin, 
0-13 
0-18 
0-16 
0-19 
0-15 
0-14 
4 Albumin, . 
5-02 
5-73 
5-82 
5-80 
5-48 
5-40 
t. Salts, 
3-20 
3-34 
3-62 
3-89 
3-55 
3-24 
Areiii- 
cola. 
Aphro- 
dite. 
Glyeera. 
Tere- 
bella. 
Nereis. 
Water, .... 
90-24 
90-34 
90-48 
90-60 
90-26 
Solids, .... 
9-76 
9-66 
9-52 
9-40 
9-74 
( Fibrin, . 
0-17 
0-19 
0-18 
0-19 
0-17 
< Albumin, 
5-72 
5-70 
5-75 
5-80 
5-74 
( Salts, 
3-87 
3-77 
3-59 
3-41 
3-83 
Besides the fact that the blood of worms contains certain pig- 
ments, very little is known concerning it. There is no real coagula- 
tion, although it contains fibrin, but a heat-coagulum is formed at 
65° C. When this coagulum is filtered off, i.e., in the case of those 
