Ciliata
Colored composition (Homage à Sebastian Johann Bach)
Comicos Ambulantes
Conifers
Corals
Count Giacomo Durazzo in the Guise of a Huntsman with His Wife (Ernestine Aloisia Ungnad von Weissenwolff
Countess Alexander Nikolaevitch Lamsdorff (née Maria Ivanovna Beck, 1835–1866)
Country Home in Freiburg
Country Home Near Stuttgart, Germany
Couple at the garden table
Couple in Forest
Crinoids
Crown Prince of Germany's Children frolic on what appears to be a ship's ratline or rope ladder
Cruise to the North Sea via Bremen
Crustaceans
Ctenophorae
Day of allied victory, 1917