Hydrarchos Advertisement

In 1845, fossil hunter Albert Koch mounted a tour of what he promoted as the extinct sea serpent "Hydrarchos." In fact, the skeleton was constructed with fossils from at least five Basilosaurus cetoides skeletons that Koch had collected in Alabama, as well as a number of invertebrates. The skeleton was destroyed in the Allied bombing of Germany during World War II.

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DO NOT NEGLECT SEEING THE TRULY EXTRAORDINARY EXHIBITION NOW OPEN IN Niblo's Garden, DURING THE FAIR.
THE HYDRARCHOS!!
OR LEVIATHAN!
Of the Antediluvian World!
As described in the Book of Job, Chapt. 41.
THIS IMMENSE SKELETON OF A SEA SERPENT
Exceeds 114 FEET in Length! and when ALIVE! must have measured 30 FEET IN CIRCUMFERENCE!!
WEIGHING AT LEAST 400,000 POUNDS.
This wonderful relic of former times, the sovereign master and greatest monument of all animal
Creations was recently discovered by Dr. A. C. KOCH in Alabama.

Vintage exhibition poster advertising the Hydrarchos, or “Leviathan,” with an illustration of a massive sea serpent skeleton displayed inside a large hall.
Vintage exhibition poster advertising the Hydrarchos, or “Leviathan,” with an illustration of a massive sea serpent skeleton displayed inside a large hall.