Macrostomum appendiculatum | Jul 1-Aug2, 1937 | | | slow flowing brook and bog pool in the surroundings of Laugarvatn, 1 specimen. |
Gieysztoria oligocentra | Jul 1-Aug2, 1937 | | | at the landing stage of the Gistihus, near hot springs, water with smell of sulfur, 22-27 degrees C, 1 specimen. |
Gieysztoria cuspidata | Jul 1-Aug2, 1937 | | | |
Microdalyellia armigera | Jul 1-Aug2, 1937 | | | in a slow flowing brook, a bog pool in surroundings of Laugarvatn, several specimens. |
Castrella truncata | Jul 1-Aug2, 1937 | | | in a slowly flowing streamlet and in bog pools near Laugarvatn. |
Castrada stagnorum | Jul 1-Aug2, 1937 | | | bog pool and brook moss surrounding Laugarvatn, Alptavatn and undrained cold and clear crater of lake Kerio east of Prastalundur. |
Castrada inermis | Jul 1-Aug 2, 1937 | | | clear streamlet issuing from a spring which empties slowly into Laugarvatn. |
Castrada viridis | Jul 1-Aug 2, 1937 | | | slow flowing clear brook issuing from a spring and emptying into Laugarvatn, 2 specimens. |
Castrada affinis | Jul 1-Aug 2, 1937 | | | bog pool north of Laugarvatn, 1 specimen. |
Bothromesostoma personatum | Jul 1-Aug 2, 1937 | | | bog pool north of Laugarvatn, 1 specimen. |
Geocentrophora baltica | Jul 1-Aug 2, 1937 | | | slowly flowing clear brook issuing from a spring near Laugarvatn. |
Otomesostoma auditivum | prior to Aug 1937 | | | Author received material collected by Danish zoologists. |
Otomesostoma auditivum | Jul 1-Aug 2, 1937 | | | pools near Laugarvatn |
Microstomum sp. | summer 1937 | | | Many specimens. |