Published online by Cambridge University Press: 05 June 2009
1. A new species Choanotaenia larimarina sp.nov. from the greater black-backed gull (Larus marinus) is described.
2. A comparison is made with other species of Choanotaenia which possess a reticulate uterus.
3. Because the uterus breaks down in only one of these four species it is suggested that in this type of development the breakage may be due to mechanical stretching of the tubule in the gravid segment.
4.If this be true then the portion of the uterine wall which envelops the egg is not a uterine capsule in the accepted sense.