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In a previous paper (8) an organized structure was described in the macronuclei of certain old organisms of Tokophrya infusionum. It was found that the same honeycomb structure appears in great abundance in the macronuclei of overfed organisms. This permitted a better three-dimensional reconstruction of the described structure. Since the defined structure may be experimentally induced, it offers an opportunity for further more detailed studies as to its nature and meaning.

Elektronenmikroskopische Untersuchungen am sessilen Susswasser-ProtistenTokophrya infusionum zeigen besonders komplizierte Strukturen der «Tentakel» und der «Haftscheibe». Die Tentakel sind von zwei Membranen umgeben und umschliessen eine Anzahl von Langselementen. Ihre Spitzen sind aus einer grosseren Zahl von «Papillen» zusammengesetzt. Die Haftscheibe besteht aus einem reichen Fibrillennetz.

The life-cycle of Subulura suctoria, a caecal nematode of poultry in Egypt had been worked out for the first time. The prepatent period was 45 days. The morphological features of the different larval stages found in experimentally infected chicken as well as the adult worms are presented. The present situation of the genus Subulura and its proper place is also discussed.

By random examination of various insects for cysticercoides of tapeworms, larvae of round worms were encountered attached to the intestinal wall of beetles, Ocnera hispida and Blaps polycresta. The morphological features of the larvae were discussed and materials from infected beetles were fed to chicken and we obtained embryonated eggs from their droppings and on making post-mortum examination of chicken, adult Subulura suctoria worms were found.