df_roster — the book's own index of the thirteen. A field guide is printed before the naturalist sails: the plates and the binomials are already in it, and what fills in at sea is the record of what was actually seen. So the journal draws its pages from this index — name, binomial, stratum, the depths the animal is printed as keeping — and every one of those facts is REPLACED, field by field, by the species module's own spec the moment that module registers itself. The caption under each entry is the caption to the book's own plate in `df_plates`. A species module's `silhouette` / `motion` / `response` strings always win over it; where a module has not landed, the entry reads as a printed page whose field notes have not been taken yet, which is exactly what it is. Slice owner: journal. The species facts themselves are the fauna slices'.