Abstract
Many herpetomonads have been recorded from various insects belonging chiefly to the Diptera and Hemiptera, but until the present instance, members of this genus of flagellates have not been found in the Mollusca and very few in other Invertebrata. Also the habitat of the herpetomonads has usually been either the main alimentary tract or the haemocoel of their hosts. Digestive glands hitherto have not been recorded as being infected.