i;o PHYSIOLOGY OF THE INVERTEBRATA. 



measure ^xrer i^i \>o'0a. diameters. The pale ones rsW "^ awu 

 down to ^00 '< BirVo j ^^ latter are multinucleated. 



" The pigment itself in the fresh state showed no distinct 

 bands, but treated with caustic potash in the solid condition 



Echinochrome 

 + KHO, fresh 

 clot. 



Echinochrome 

 in "Serum." 



Do. + Stan- 

 nous chloride. 



Echinochrome 

 in blood clot. 



Do. + NaHO. 



Do. in absolute 

 alcohol. 



Do. with acetic 

 acid. 



Do. with stan- 

 nous chloride. 



Dried clot in 

 ether. 



Do. in chloro- 

 form. 



Do. in carbon 

 bisulphide. 



Do. in benzene 



Fresh clot in 

 glycerine.. 



Do. with stan- 

 nous chloride. 



Fig. 29.— Spectra of Perivisceral Fluid of Strongylocentrotus lividus. 

 [After C. A. MacMunn.) 



the colour changed to dark purple " and showed the bands in 

 the spectrum a (Fig. 29). 



MacMunn says that the deepening of colour which 

 echinochrome undei'goes on exposure to the air must be in 



