form

Illustration of <n>Periphylla mirabilis</n> by <n>Ernst Haeckel</n> and <n>A. Giltsch</n> for the <n>Voyage of HMS Challenger</n>.

An 1881 illustration of the jellyfish <n>Pectanthis asteroides</n> by artist <n>Ernst Haeckel</n>.

An 1881 illustration of the jellyfish <n>Thamnostylus dinema</n> by artist and biologist <n>Ernst Haeckel</n>.

An illustration published by <n>James Sowerby</n> in 1806.

<n>Figure generated by a vibrating rod</n> by <n>Étienne-Jules Marey</n>, c. 1890-92.

An 1896 X-ray photogravure of an <n>Aesculapian snake</n> by <n>Josef Maria Eder</n> and <n>Eduard Valenta</n>.

<n>Harmonograph pattern</n>, a salted paper print by artist <n>Benjamin Creswick</n>, c. 1890.

An albumen silver print by <n>Edward J. Woolsey</n> from his 1869 book <n>Specimens of Fancy Turning</n>.

An image from <n>Specimens of Fancy Turning</n> (1869) by <n>Edward J. Woolsey</n>.

An 1862 illustration of Acanthometra by <n>Ernst Haeckel</n> from his monograph <n>Die Radiolarien</n>.

Plate 2 from <n>A collection of different kinds of marble</n> by <n>Jan van der Baren</n>, 1676.

<n>Ratte</n> (1896), a photogravure from an X-ray by artists <n>Eduard Valenta</n> and <n>Josef Maria Eder</n>.

A lithograph of <n>Periphylla mirabilis</n> by <n>Ernst Haeckel</n> from the 1873-76 <n>Challenger expedition</n> report.