W. G.  Van Name, ?Ascidians of the West Indian Region and southeastern United States?, Bulletin of The American Museum of Natural History, vol. 44, pp. 283-494, 1921.

W.  Michaelsen, ?Ascidien vom Westlichen Indischen Ozean aus dem Reichmuseum zu Stockholm?, Arkiv foer Zoologi, vol. 13, pp. 1-25, 1921.