Rept. U. S. Fish Comm. for 1886, Appendix B, pp. 513-534, Washington, 1889.
The origin of the present outlines of the Bermudas.
Amer. Geologist, vol. v, no. 2, pp. 88-100, Minneapolis, 1890.
On excavations made in rocks by sea-urchins.
Amer. Naturalist, vol. xxiv, pp. 1-21, Phila., 1890.
On certain peculiarities in the flora of the Santa Barbara Islands.
Amer. Naturalist, vol. xxiv, pp. 215-224, Phila., 1890.
A zoölogical reconnoissance in Grand Manan.
Amer. Naturalist, vol. xxiv, pp. 423-438, Phila., 1890.
Sea-urchin excavations at Guaymas, Mexico.