SALT REQUIREMENTS AND ORIENTATION OF LIGIA IN BERMUDA. III

¹ From the Osborn Zoölogical Laboratory, Yale University

1. In the sea Ligia orients toward the shore. The greater diffuse light from the open ocean appears to be the most important factor.

2. Young specimens recently released from the brood pouch were found in the sea.

3. When kept on filter paper moistened with salt solutions Ligia shows the same toxicity series as when immersed in solutions or kept in air with access to the solutions.

4. NH₄Cl, like KCl, exerts a specific paralyzing effect on the gill movements.

5. Increasing the potassium content of artificial sea water fourfold or more has a marked effect in shortening the life of immersed animals.