This lot includes Volumes I, II, III, VII and VIII.  4 of the volumes have perfectly straight splits right down the spine.  This is how I purchased them, and am not sure why they are like that.  Volume III is the only volume with the spine not split.  

Volume I- History of the Earth

Volume II- An History of Animals

Volume III- An History of Animals, Ruminating Animals

Volume VII- An History of Testaceous Fishes

Volume VIII- An History of Insects