 Complete the following phrase:  Charles Darwins seminal text On the Origin of Species was published on 24 November 1859. Charles Lyell had greatly influenced Darwin, as Robert FitzRoy gifted him a copy of Lyells Principle of Geology before Darwin embarked on his five-year voyage aboard and Lyell wrote personally to Darwin in April 1843 to announce his findings on the expedition with Abraham Gesner. Darwin built a considerable amount of his theory regarding natural selection and evolution on Lyells 1852 study of the Joggins Formation, noting that the incompleteness of the fossil record at Joggins was responsible for gaps in Darwins theory and saying this incompleteness had contributed to a misconception of abrupt, though perhaps very slight, changes of form. Lyell helped publish Darwins theories, but did not support them as natural selection conflicted with his religious beliefs. In 1863, John W. Dawson published Air-Breathers of the Coal Period, both a catalogue of all known species from the Joggins Formation at the time and a response to On the Origin of Species. Dawson argued that the presence of fossils like Dedropupa which hed first reported on in 1860 disproved Darwins theory, as this land snail was virtually identical to its modern counterparts, and thus the body plan of snails had not changed in 300 million years. Dawsons disbelief in natural selection was not based in religious concerns, as he did believe in deep time and the notion that higher forms of life had appeared progressively and at different periods in Earths history; in 1865 he would argue that Eozoon canadense represented the earliest form of life. Samuel Wilberforce had also referenced Dedropupa in his 