Brooks and Conklin, Johns Hopkins Univ. Circ. x. 1891, No. 88.
C. E. Borchgrevink, "First on the Antarctic Continent," 1901, p. 227.
M. J. Delap, Irish Naturalist, x. 1901, p. 27.
E. W. L. Holt, Report on the Sea and Inland Fisheries of Ireland for 1902, pt. ii. 1903, p. xvi.
F. W. Gamble. See E. T. Browne, Proc. Roy. Irish Acad. 1900, p. 735.