ISO PHYSIOLOGY OF THE INVERTEBRATA. 



measure ;j^Vo in both diameters. Tlie pale ones Yi-nio ^ u oVo 

 down to 5oVo '^ iroVo '■> t^© latter are multinucleated. 



" The pigment itself in the fresh state showed no distinct 

 bands, but treated with caustic potash in the solid condition 



B c 



D 



Eb 



f 



Echinochrome 

 + KHC), Iresh 

 clot. 



Echinochrome 

 in " yerum." 



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 



Eresh clot in 

 m ^^K^y. _ Vci'^3l^^,-&-i^" '.-'.'M^^^^^^^^^H glycenne. 



Do. with stan- 

 ^^^^^ nous chloride. 



Fig. 29. — Spectra ok Pi;kivisci:kai. Fluid ok Stkongyi.ucentkotus lividls. 



{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 undergoes on exposure to the air must be in 



J 



