George Brettingham Sowerby III
He , too , worked ( like his father George Brettingham Sowerby II and his grandfather George Brettingham Sowerby I ) on the "Thesaurus Conchyliorium" , a comprehensive , beautifully illustrated work on molluscs . 
<triplet> George Brettingham Sowerby II <subj> George Brettingham Sowerby I <obj> father