He served as the chief scientist on the Challenger expedition.

In 1872 the Challenger expedition began; it spent three years studying the oceans.

Living members of the group were found after the Challenger expedition of 1872-76 began to explore the deep sea.

The Challenger expedition of 1872-1876 studied processes of the sea floor.

Among other duties, he wrote about the gull specimens from the Challenger expedition of 1872-1876.

The feature is roughly mapped on the 1874 chart by the Challenger expedition.

He also was a contributor to the description of the specimens obtained from the Challenger expedition (1872-1876).

It was more accurately charted and named on an 1874 chart by the Challenger expedition.

He also examined specimens from the Challenger expedition after his return to England.

Still more important were his later researches connected with the Challenger Expedition.