70 ARKIV FÖR ZOOLOGI. BAND 13. N:0 16. 



recherches attentives, trouver le Branchipvs stagnalis, ». 



Carl (1912, p. 361) konnte fiir Triops cancriformis bei Geneve 

 dasselbe konstatieren: »A la suite d'une généralisation pré- 

 maturée, on a affirmé tout récemment encore que VApus 

 cancriformis et un allié, le Branchipus siagnalis, apparaissent 

 toujours ensemble. L'auteur des 'Phyllopodes', dans le 

 Catalogue des Invertébrés de la Suisse, s'est déjå inscrit en 

 faux contre cette affirmation et notre trouvaille liii donne 

 raison. Ni dans les orniéres a Apus, ni dans les gouilles et 

 fossés de ce plateau nous n'avons pu découvrir, en nous 

 servant du filet, de traces du Branchipus^, V. Brehm fand, 

 dass Estheriden dem Triops cancriformis zum Opfer fielen 

 (Brehm 1911, p. 208). Endlich hat Johansen L. arcticus 

 recht ausfiihrlich behandelt (1912, p. 334): »Their food, which 

 they mainly seek in the mud at the bottom, consists of 

 smaller animals; but that they may also take free-swimming 

 forms I found in July 1907 by keeping a number of Daphnia 

 pulex and Apus together in a glass with water; they captured 

 the Cladocera by movements of the body and feet, but it 

 was only when they had worked their prey up to the mouth 

 that they got a firm hold of it and ate it up. Their greediness 

 was very great and at last there was not a single Daphnia 

 left, and as there was no more food in the glass the Apus 

 gradually died; which seems to show that when they are 

 free they must constantly have a supply of food to be able 

 to exist. That they may also be satisfied with dead animals, 

 I observed on ^^s 1907, when I saw the Apus tearing up 

 their dead comrades which lay on the bottom, so that only 

 the carapace remained». Lilljeborg sagt 1877 in bezug auf 



die Notostraken (p. 7): » on les voit souvent au fond 



de Teau ou, ä Taide de leurs pattes antérieures, ils agitent la 

 vase et semblent la fouiller». 



Eine etwas abweichende Ansicht vertritt M. Hartog 

 (1901—03, p. 157). Wie schon friiher bemerkt wurde, be- 

 spricht er gleichzeitig »Apus>> und »Branchipus»^ und fasst 

 in folgenden Worten seine Beobachtungen zusammen: »The 

 food consisted of the floating materials in the water, and 

 was swallowed by the combined movements of the mandibles 

 and the peristaltic action of the guUet». 



Es kommen iibrigens in der Literatur noch mehrere 



^ Welche Arten ist nicht angegeben. 



