SECT. 12] CYCLOSES, PHOSPHORUS, SULPHUR 



1243 



authors also worked with another crustacean, the sand-crab, Emerita 

 analoga, obtaining the following results : 



Here again, then, we have an egg which is independent of its environ- 

 ment as regards phosphorus and one in which only a small synthesis 

 of nucleins takes place. On the other hand, its lipoid phosphorus 

 diminishes considerably. 



12-12. Phosphorus, Lipoids and Sterols in Worm and Echino- 

 derm Eggs 



Faure-Fremiet's analyses of the undeveloped eggs of the polychaete 

 Sabellaria alveolata showed i-8i per cent, dry weight of cholesterol and 

 2- 1 6 per cent, dry weight of " unsaponifiable X", but he made no 

 determinations on hatched worms. On the other hand, in his study 

 of the development of the nematode Ascaris megalocephala, he did 

 investigate the distribution of phosphorus before and after the develop- 

 ment of the eggs. The phosphorus is here expressed as phosphorus 

 pentoxide. 



% weight % of the 



* Called improperly by Faure-Fremiet "nuclein phosphorus". 



The inorganic phosphorus remains constant, then, the Hpoid phos- 

 phorus gains and the rest of the phosphorus loses by some 5 per cent. 

 This state of affairs so contrary to what we find to take place in the 

 hen's egg recalls the similar finding in the case of the silkworm and 



