Castrada (Castrada) stagnorum | Jul 1-Aug2, 1937 | | | undrained cold and clear crater of lake Kerio east of Prastalundur. |
Castrada (Castrada) luteola | Jul 1-Aug 2, 1937 | | | crater lake Kerio, a few specimens. |
Otomesostoma auditivum | prior to Aug 1937 | | | Pingvallavatn. Author received material collected by Danish zoologists. |
Microstomum sp. | summer 1937 | | | few specimens found at Geldingaey, east of the bridge. |
Strongylostoma elongatum elongatum | 1948 or earlier | | | |
Rhynchomesostoma rostratum | 1948 or earlier | | | |
Bothromesostoma personatum | 1948 or earlier | | | |
Arthurdendyus triangulatus | | | | |