He recognised that animals did not exactly fit into a linear scale, and noted various exceptions, such as that sharks had a placenta like the tetrapods.
hiː ɹˈɛkəɡnˌaɪzd ðæt ˈænɪməlz dɪdnˌɑːt ɛɡzˈæktli fˈɪt ˌɪntʊ ɐ lˈɪnɪɹ skˈeɪl, ænd nˈoʊɾᵻd vˈɛɹiəs ɛksˈɛpʃənz, sˈʌtʃ ɐz ðæt ʃˈɑːɹks hæd ɐ pləsˈɛntə lˈaɪk ðə tˈɛtɹɐpˌɑːdz.