Image source: Cushman, J.A. 1913. A Monograph of the Foraminifera of the North Pacific Ocean. Part III. Lagenidae. Bull. U.S. Nation. Mus 71: ix+125 pp.+47 pls.
Sidebottom H. 1912. Lagenae of the South-West Pacific Ocean. From soundings taken by H.M.S. Waterwitch, 1895. Journal of the Quekett Microscopical Club (2) 11 (70): 375-434 , available online at (http://www.biodiversitylibrary.org/item/15550#page/5/) page(s): p. 395 pl. 16 fig. 18-21
