. Animal aggregations, a study in general Animal ecology. 40 ANIMAL AGGREGATIONS current. Jennings (1906), in his discussion of this reaction, says, ''When a Paramecium is transverse or obUque to the direction of a. 1 2 Fig. I.—(i) Arenicola larva in the free-swimming state proceeding on a spiral course, m, n, Directions of light; a-/i, positions in the spiral. Larvae react to changes in ray direction in positions b or d, but not in positions a and e. (2) Much enlarged sketch of larval head. The eye-spots are composed of a dark-brownish part y and a clear part x. Note the ciliary b
. Animal aggregations, a study in general Animal ecology. 40 ANIMAL AGGREGATIONS current. Jennings (1906), in his discussion of this reaction, says, ''When a Paramecium is transverse or obUque to the direction of a. 1 2 Fig. I.—(i) Arenicola larva in the free-swimming state proceeding on a spiral course, m, n, Directions of light; a-/i, positions in the spiral. Larvae react to changes in ray direction in positions b or d, but not in positions a and e. (2) Much enlarged sketch of larval head. The eye-spots are composed of a dark-brownish part y and a clear part x. Note the ciliary bands on (2) which are a part of the locomotor system. (From Mast, Liglit and the Behavior of Organisms; courtesy of Wiley & Sons.) current at the time when the circuit is closed (Figure 2) certain strik- ing effects are produced. If a current of medium strength is em-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Allee, W. C. (Warder Clyde), 1885-1955. Chicago : The University of Chicago Press
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