An early descriptive associational and habitat study of the marine animals of our coast. A kind of work, in its standpoint, far in advance of the times. It is remarkable that this well-known work has not been a model for other similar studies on our coast.

Davenport, C. B.

1903. The Collembola of Cold Spring Beach, with Special Reference to the Movements of the Poduridae. Cold Spring Harbor Monogr. II. pp. 32.

An excellent study of a single group in a habitat, and its relation to behavior.

1903a. The Animal Ecology of the Cold Spring Sand Spit, with Remarks on the Theory of Adaptation. Decennial Pub. Univ. Chicago, Vol. X, pp. 157-176.

An associational study of a sea beach.

Petersen, C. G. Joh., and Jensen, P. B.

1911. Valuation of the Sea. I. Animal Life of the Sea-Bottom, its Food and Quantity. Rep. of Danish Biol. Sta. to Board of Agriculture, Vol. XX, pp. 1-76. Transl. from Fiskeri-Beretning for 1910. Copenhagen.

The sea-bottom animals are studied as a community. The most important study of the kind known to the writer. Similar work should be done in American waters.

Warming, E., Wesenberg-Lund, C., and others.