A small number of palaeontological memoirs fitting in no regular series were produced, the first in 1841 - 'Figures and description of the Palaeozoic fossils of Cornwall, Devon and West Somerset' by John Phillips. This was the Survey's second memoir and it was a substantial work discussing the age significance of the pre-Culm-Measure fossils. A second memoir on 'The Vertebrata of the Forest Bed Series of Norfolk and Suffolk'. A third palaeontology memoir 'The vertebrata of the Pliocene deposits of Britain' 1891 is classified as part of the 'Stratigraphical Memoirs'.