Abstract
1. Between November 1936 and February 1937, ninety-six rabbits were examined, whilst between August 1937 and July 1938, 446 rabbits were examined for cestode parasites. The rabbits were obtained from the same area.2. The rabbits were infected with the following cestodes to the extent given, for the two periods respectively: 3. Two species of the genusHymenolepisare recorded for the first time from the rabbit, and they are briefly described.4. The seasonal fluctuations in the incidence of the above cestodes are discussed.5. The span of life of bothCittotaenia pectinataandC. denticulatais seen to be not greater than 10 months, and evidence is given to show that the intermediate host ofC. denticulatais available between April and December, and that ofC. pectinatafrom August to April.6. Evidence of host and age resistance is demonstrated inCysticercus pisiformis.