There was "evening and morning" of the third day, i.e., beginning and completion, and also the whole interval of the fourth day, before the command of the fifth.
It is remarkable that the Trilobites rapidly culminated, so that we have the largest and most perfect forms, such as Paradoxus, with the lowest (Agnostus) in the same beds in Wales (Etheridge's "Phillips' Manual," Part II. p. 32).
I have done my best to verify this from the well-known latest Manuals of Etheridge, Seeley, and Alleyne-Nicholson.