Interstitial meiofauna turbellarians (Haplogonaria syltensis, Nernatoplana coe1ogynoporoides) and polychaetes (Trilobodrilus axi, Hesionides arenaria) from surf-beaten sand beaches are able to absorb dissolved I4C-labelled glycine and aaminoisobutyric acid. In contrast, absorption by the copepod Rhizothrix gracilis is negligible. Uptake has been confirmed by autoradiographic studies, liquid scintillation counting of labelled and combusted animals, and by measurement of the incorporation of labelled glycine into proteins of the animals investigated. The nutritional profit of the absorbed glycine seems to be small: between 2 % and 8 % of the energy requirement of Hesionides arenaria. Nevertheless, the significance of the amino acids taken up by these soft-bodied species can be presumed because the uptake systems function optimally under conditions similar to those in the natural environment. Glycine uptake rates are hlghest at sallnities of 30 to 35 %o in H. syltensis, in N. coelogynoporoides and H. arenaria. In T. dui uptake rates are higher, beyond this range, a fact corresponding to the higher salinity resistance of this species. Glycine uptake 1s positively correlated with increasing temperature, attaining maxima at 20 O and 25 "C, respectively. In winter, total absorption rates are strikingly higher than in summer. This demonstrates season-specific capacity adaptation with almost ideal compensation in N. coelogynoporoides and supraoptimal compensation in T. axi, and corresponds to prevailing temperatures in the natural habitat.

Um wirklich Erfolg bei Bekämpfung tierischer Schädlinge bei Pflanzen, Mensch und Tier zu haben, muß sie tatkräftig in allen Entwicklungsstadien der tierischen Parasiten durchgefiihrf werden. So ist es auch beim Bandwurm, der Taenia saginata. Daran zu beteiligen haben sich: Landwirt, Tierarzt, Arzt.Der Landwirt muß zu verhindern suchen, daß seine Rinder mit Bandwurmeiern verunreinigtes Futter (Roh-, Grünfutter, Heu u. dgl.) von Stellen erhalten, auf die Abortwässer gekommen sind, sei es durch Überschwemmung von Flüssen, die solche Abwässer aufnehmen, sei es durch sogenannte Riese!felder, sei es, daß er selbst Abortjauche aus Stadt und Land daraufgebracht hat.An dieser Stelle möchte ich schon betonen, daß die Band-