Abstract
Studies were made during the summer of 1926 in West Greenland on 1 Chaetognath and 3 Schizopods, all very abundant and important as food for whales, seals, and other organisms. In Sagitta elegans arctica the growth of the ovaries plotted against the body length approaches a log- arithmic straight line. Boreomysis nobilis probably has a prolonged breeding period during the summer and autumn. Bimodal curves for size in the populations of Thysanoessa inermis and raschii and Sagitta suggest 2 distinct broods whose breeding cycles overlap.

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