Bats, from Ernst Haeckel's seminal Kunstformen der Natur (1904). Adrian will discuss Haeckel in lecture 3 of his Art & Science series. Haeckel, a zoologist-artist (that doesn't quite cover his achievements), popularised Darwin in Germany (On the Origin of Species was published in 1859).
Haeckel's system of imaging and composition is of a laid-bareness, a head-on symmetry that emphasizes recurring geometries across species and nature. This supports his "recapitulation theory ('ontogeny recapitulates phylogeny') claiming that an individual organism's biological development, or ontogeny, parallels and summarizes its species' entire evolutionary development, or phylogeny." (Wiki).
He sometimes resorts to a more illusionistic, three-dimensional space but it is quite rare through the 100 or so plates. It happens through his motive to articulate and reveal. This is perhaps unfamiliar to you and a step you are required to take in the project. That is, composition, formal decisions borne out of a need to explain.