On Variations in size of the Nematode Worm Rhabditis succaris n. sp., produced by Different Culture Media

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Abstract
(1) During the routine examination of the fauna of samples of clinker removed from the filter beds of Brent Sewage Farm several species of Rhabdilis were met with, one at least of which cannot be relegated to any species as yet described. A new species is therefore suggested for its reception and the name succaris has been given to suggest its origin from the sewage farm.(2) An account is given of its structure. While being typical for the genus, the lips and bursal rays do not agree with any known species.(3) Two distinct strains were reared by means of different culture media, differing quite definitely in length. A thousand worms were measured and these differences were found to remain very constant. The relative measurements have not been materially altered.(4) The length of the large worms has been diminished by means of a return to the original food.(5) The cultivated strain shows greater variability than the original strain.(6) Two graphs and a table summarising the results are shown.

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