Jackson, the Amphipod Byalella Rnickerbockeri. 
59 
contact with the glass, or they may come to rest curled up in the 
surface film, the surface tension then producing the contact stim¬ 
ulus. In their natural habitat their thigmotactic tendencies are 
exhibited in the manner in which they crawl among the objects; 
they will crawl into algae or mud until the entire body is in contact, 
the antennae in the meantime protruding into the water. 
LITERATURE CITED. 
Adams, C . C. 
1909. An Ecological Survey of Isle Rayale, Lake Superior. 
Report Board of Geological Survey of Michigan, 1908, 
p. 18. 
Della Vale, A. 
1893. Gammarini del Golfo di Napoli. 
Fauna and Flora des Golfes von Naepel. 20 Monographic. 
Forbes, S. A. 
1888. On the Food relations of Fresh-Water Fishes: a Summary 
and Discussion. Bull. Illinois State Laboratory of 
Natural History, Vol. 11, Art. 8. 
Gerstaecker, A. 
1901. Amphipoda. Bronn’s Thier-Reicb. Vol. 5, Part 2, 
pp. 279-543. 
Holmes, S. J. 
1901, a. Observations on the Habits and Natural History of 
Amphithoe longimana Smith. 
Biol. Bull. Vol. 11, No. 4, pp. 185-193. 
Holmes, S. J. 
1901. b. Phototaxis in the Amphipoda. 
Amer. Journ. Physiol. Vol. V, pp. 211-234. 
Holmes, S. J. 
1902. Observation on the Habits of Byalella dentata. 
Science N. S. Vol. 15, p. 529. 
Holmes, S. J. 
1903. Sex Recognition among Amphipods. 
Biol. Bull. Vol. 5, pp. 288-292. 
Shelford, Victor E. 
1911. Ecological Successions. III. A Reconnaissance of its 
Causes in Ponds with Particular Reference to Fish. 
Biol. Bull. Vol. XXII., No. 1, pp. 1-38. 
Smallwood, M. E. 
1903. The Beach Flea; Talorchestia longicornis. 
Cold Spring Harbor Monographs. 1. 
