This appears to be an incomplete plate that was perhaps destined to have depicted 150 or more specimens. The inclusion of three specimens (2,23,24) that have not been spread suggests that this work might have been undertaken at the same time as the illustrated sheet of lot 320. It also gives a plausible insight into how Ellis Rowan built up the plates, starting with the centre column, and then perhaps adding columns to the right and left alternately, to fill the sheet.