1891-92.] A. B. Griffiths on the Blood of the Invertebrata. 119 
The following table represents the complete analysis of the blood 
of these Echinoderms : — 
Spatangus. 
Echinus. 
Uraster. 
Solaster. 
Water, .... 
95-769 
95-907 
95-576 
95-667 
Solids, .... 
4-231 
4-093 
4-424 
4-333 
f Fibrin, 
I 
0 046 
0-043 
0-042 
0-049 
1 
-[ Albumin, . 
2-365 
2-298 
2-460 
2-322 
1 
L Salts, 
1-820 
1-752 
1-922 
1-962 
The coagulation of the blood of Echinoderms has been investi- 
gated by Geddes,* Schafer,! and Haycraft and Garber. J 
Geddes states that the amoeboid cells coalesce into irregular 
masses and shoot out processes which bind the cells together. But, 
according to Schafer, the clot is not a mere plasmodum; there is 
also a fibrin-like substance which separates from the j^lasma ; and 
the above analyses prove the presence of fibrin in the blood of 
Echinoderms. 
According to Haycraft and Garber, “ the blood of the sea-urchin 
varies very much in the number of corpuscles present in the differ- 
ent specimens. In most cases, when allowed to coagulate, the clot 
is very small, and not easy to demonstrate in a few drops of 
blood.” 
Such is the present state of our knowledge concerning the blood 
of the Echinodermata. 
The Blood of Annelids. 
The blood of these animals is of the nature of hsemolymph. The 
author has investigated the blood of many of them. 
The following is a list of the different Annelids investigated, 
arranged in their several classes along with the names of the 
respiratory pigments contained in the blood : — 
* Proc. Roy. Soc. Lond., 1880. t Ibid., 1883, p. 370. 
X Proc. Roy. Soc. Edin., vol. xv. p. 423. 
