I30 PHYSIOLOGY OF THE INVERTEBRATA. 



incli in diameter, and that this colouring matter, also found 

 in other parts of the worm, is not haemoglobin." 



Delle Chiaje showed that in Sipunculus halanorojihus and 

 >S'. echinorhynchus " the arterial blood is red, the venous 

 brown. G. Schwalbe* found that the body fluid of Phascolo- 

 soma clonr/atum (a Gephyrean) is a bright-rose or greyish-red 

 colour, and is cloudy owing to the presence of morphological 

 elements, and that on standing in the air it gets darker and 

 darker until it assumes an intense Burgundy-red colour. 

 By long standing in the air this colour goes into a dirty 

 brown owing to decomposition, and in drying the whole 

 assumes a dirty green colour. Krukenberg f found the blood 

 of Sipunculus mcdus to contain the same colouring matter as 

 that observed by Schwalbe ; he finds that it is the oxygen of 

 the air which brings about the colour change, and that the 

 colour is removed by 00^. This colouring matter gives no 

 absorption band either in the oxidised or reduced condition, 

 Krukenberg calls this pigment h^emerythrin, and the chro- 

 mogen belonging to it haemerythrogen. The colouring 

 matter is decomposed by H„S. The oxygen in the oxidised 

 blood-pigment seems, according to Krukenberg, to be more 

 firmly fixed than in oxyhemoglobin. Milne-Edwards if in 

 1838 discovered that certain Annelids possessed green blood,, 

 his observations being made an Sahella. 



" Prof. Kay Lankester § on examining the blood of Sahella 

 ventrilahrum and Siphonostoma (sp. ?) with the spectroscope 

 discovered the interesting fact that it only gives a banded 

 absorption spectrum, but is capable of being oxidised and 

 reduced, and it behaved in such a way with potassium 

 cyanide and ammonium sulphide, as to have led him to 

 conclude that haemoglobin and this colouring matter (chloro- 

 cruorin) ' have a common base in cyanosulpha3m, and perhaps 



* Archiv. fiir M'lkr. Aaat., vol. 5, p. 248, ct seq. 



+ Vergleich. FJii/siol. titudtan, p. 85. 



X Annales des Sciences Xatnrellcs, 1838, vol. 10, p. 190. 



§ Journal of Anato7n)/ and Phi/siulo</i/, 1868, p. 114; 1870, p. 119. 



