When Lankester became
Linacre Professor of Comparative Anatomy at
Merton College, he made Goodrich his assistant in 1892; this marked the start of the researches which during half a century made Goodrich the greatest comparative anatomist of his day. In 1921 Goodrich was appointed to his mentor's old post, which he held until 1945. From the start of his researches, many of which were devoted to marine organisms, Goodrich made himself acquainted at first hand with the marine fauna of
Plymouth,
Roscoff,
Banyuls,
Naples,
Helgoland,
Bermuda,
Madeira, and the
Canary Islands. He also travelled extensively in Europe, the United States, North Africa, India,
Ceylon,
Malaya, and
Java. He worked out the significance of the tubes connecting the centres of the bodies of animals with the outside. There are
nephridia, developed from the outer layer inward and serving the function of
excretion. Quite different from them are coelomoducts, developed from the middle layer outward, serving to release the
germ cells. These two sets of tubes may look similar, when each opens into the body cavity through a funnel surrounded by cilia which create a current of fluid. In some groups the nephridia may disappear (as in vertebrates, where the nephridia may have been converted into the
thymus gland), and the coelomoducts then take on the additional function of excretion. This is why man has a
genitourinary system. Before Goodrich's analysis, the whole subject was in chaos. Goodrich established that a
motor nerve remains linked to its corresponding segmental muscle, however much it may have become displaced or obscured in development. He showed that organs can be
homologous without arising from the same
segments of the body. For example, the fins and limbs of vertebrates; and the
occipital arch (the back of the skull), which varies in vertebrates from the fifth to the ninth segment. He distinguished between the scale structures of fishes, living and fossil, by which they are classified and recognised. This is important because different
strata may identified by fossil fish scales. Goodrich's attention was always focused on
evolution, to which he made notable contributions, firmly adhering to Darwin's theory of
natural selection. On his seventieth birthday, in 1938, his colleagues and pupils published a
festschrift edited by Gavin de Beer:
Evolution: essays on aspects of evolutionary biology. ==Selected works==