The Zoology of the Voyage of Erebus & Terror under the Command of [Captain Sir] J[ames] C[lark] Ross, during the years 1839 to 1843 / [by Authority of the Lords Commissioners of the Admiralty. Edited by John Richardson, M.D., F.R.S., &c. and John Edward Gray, Esq., Ph.D., F.R.S., &c.]. - London : Longman, 1844