Marine freeliving Nematodes from Danish waters. By Hjalmar Ditlevsen, Zoological Museum, Copenhagen. J. he present paper is a contribution to the knowledge of the freeliving Nematodes of Danish waters. The material was partly dredged. partly collected littorally on piers and bridge-pillars among Algæ and Hydroids or on overgrown stones in the edge of the water. In the bottom Nematodes seem to be found everywhere, even in clean sand, where some of the largest and most interesting forms were taken. The amount of material obtained by the dredge was considerable. The great majority of the specimens were collected by the author during the last years on stays at the coast in the summer season. For some forms I am indepted to Mag. P. Kramp who has kindly forwarded to me the material washed off from Hydroids, collected by him at different localities. My work has been subventioned by the Japetus Steenstrup fund and by the Carlsberg fund. 1 beg to offer my best thanks to both these institutions and to the Carlsberg fund for having paid the reproduction of the piates. On the whole marine freeliving Nematodes have been hitherto but little investigated. Considering the multitude of interesting forms belonging to this group it appears Strange that so few investigators have paid any attention to these animals. On this occasion 1 shall not enter into details as to the historical point of view. For all nemato-logists Bastian's Monograph and de Man's papers are fundamental 10*
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