248 "TERRA N07A" EXPEDITION. 



Characters. — An ak-oliolic solution, when treated with strong H28O4, shows 

 a blue colouration at the junction of tlie two fluids, identical with the reaction 

 for the lobster pigment and carotin. This indicates a lipochronie. Spectro- 

 scopically, in solutions judged to be of equal concentration, the same bands 

 appeared in the unknown pigment and in a solution of the lobster pigment. 

 The main band appeared to extend to 525X. in the concentration used. Attempts 

 to fractionate between alcohol and petrol ether gave no certain result. When 

 fractionated between an aqueous alcoholic solution and petrol ether, the pigment 

 often deposited as a brick-red precipitate between the solvents, which l)ecame soluble 

 again upon treatment with alkali. 



Solutions in carbon disulphide and chloroform were red, in ether yellow. In 

 alcohol, they were more reddish than a carotin solution of the same concentra- 

 tion, as judged by the tint. Solutions faded rather rapidly. 



Discussion. — In general appearance the pigment resembles the crustaceorubin 

 of Newbigin, though its solubility in alkali indicates a difference. There seems 

 little doubt that we have to do with a lipochrome pigment. Owing to the rarity 

 of the organism, the investigation of the pigment upon the scale employed by 

 Willstatter and Stoll (Chlorophyl, 1913) has been clearly out of the question. 



Conclusions. — The pigment is a lipochrome forming yellowish red solutions 

 in alcohol, and red in chloroform and carbon-disulphide. Spectroscopically it 

 resembles the red pigment of the lobster, but dift'ers from this in certain other 

 respects. 



