. The crustacea of the plankton, July, 1894-Dec., 1896 . Fig. 22.—Population of the 3 m. levels, 1895. Scale, 1 space = 100,000 Crusta-cea. The and 50,000 divisions are indicated. See page 387. Trans. Wis. Acad., Vol. XI. Plate XXXIII. 0- 3 m Mch. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 4UU 300200100 \^ _ V: /\~ \ - / _ - --• -. 9-12 m 12-15 m 15-18 m

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