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Journal of Experimental Biology 30,534-544 (1953)
Published by Company of Biologists 1953

The Inorganic Constituents of the Sea-Urchin Egg

LORD ROTHSCHILD ¹ and H. BARNES ¹

¹ Department of Zoology, University of Cambridge, and The Marine Station, Millport

1. The principal inorganic constituents of the unfertilized egg of Paracentrotus lividus have been analysed by chemical methods. The results of the analyses, in millimoles per kg. of water in the eggs (dry weight of eggs, 24%; density, 1.09), were:

The figures in brackets are the concentrations of the same substances in Roscoff sea water, chlorinity 19.37 in the same units.

2. The total phosphorus content of the eggs was about 2 mg./ml. eggs, somewhat over half of this being acid-soluble phosphorus.

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