Herbarium specimen, mounted on cartridge paper; held in place with narrow strips of white paper. Water whorl grass. In black ink at bottom left "Catabrosa aquatica/ Stream nr. Quarry/ Foynes June 1903/ M.C. Knowles."; in pencil at bottom right "1793/499" Oval blue stamp at bottom right "Science and Art Museum/ Dublin" on outer ring, "Herbarium" across centre.