Abstract
1. 1. Three distinct phases of migratory activity of Hymenolepis diminuta in the rat intestine were discerned from examination of the intestinal distribution both of wet weight of worm tissue and of scolices. These phases were: (a) anteriad migration during host fasting in 5- to 7-day-old worms, involving only the anterior 20 in. of the intestine; (b)_a brief period (7–8 days) when no migration occurred, followed by (c) the reverse of phase I migration, in worms over 8 days old, involving the entire length of the intestine. 2. 2. Levels of tapeworm glycogen, but not worm protein nor free amino acids, fluctuated diurnally. Patterns of worm growth and host growth also showed diurnal periodicity, irrespective of the dietary regime. Dietary quality, however, did affect worm migration, the latter being suppressed by suboptimal diets fed to to the host. 3. 3. Migration is considered to the related to the “crowding effect” and may be due to intraspecific, and possibly also interspecific, competition for glucose.
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