What are the names carved on the outside of Dyche Hall?

Six prominent naturalists' names can be seen on the outside of Dyche. On the east front side: Charles Darwin and Thomas Henry Huxley On the north side: John James Audubon and Asa Gray On the south side: Edward Drinker Cope and Louis Agassiz The north side of the building has an extension that was built on in the mid 60s. So Gray and Audubon are not visible.