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in the hinge of bivalve mollusks and its development, with an attempt toward a better classification of the group; and lastly a report on the forms collected.

WILLIAM HEALEY DALL. On Dynamic influences in Evolution.

Proc. Biol. Soc. of Washington, VI, pp. 1-10, issued separately May 8, 1890.

A statement of the author's position in regard to the views, sometimes termed Neo-Lamarckian, for which the term Dynamic Evoletion is here proposed.

WILLIAM HEALEY DALL.  A Critical Review of Bering's first expedition, 1725-1730, together with a translation of his original report upon it, with a map.

Nat. Geog. Mag. II, No. 2, June, 1890, pp. 1-57.

A review of the expedition, its causes, the circumstances under which it was made, the literature to which it gave rise, and an estimate of its geographical results, together