Abstract
1. Some account of the occurrence of“Hepaticola” hepaticain various hosts is given, and it is recorded from the wood-mouse (Apodemus sylvaticus) in England.2. Some additions and corrections are made to the morphological des scription of“H.” hepatica, which is shown to possess characters (presence of “bacillary bands,” presence of a spicule in the male) the supposed absence of which had led to the erection of the genusHepaticolaas distinct fromCapillaria.3. The status of the generaHepaticola, Eucoleus, Thominx, CalodiumandLiniscusis discussed, and the conclusion is reached that these should all be suppressed as synonyms ofCapillaria, which is redefined.