1898. Zoölogy: Marine Invertebrates, pp. 67-96. Grabau, A. W., and Woodman, J. E. (editors). Guide to Localities Illustrating the Geology, Marine Zoölogy, and Botany of the Vicinity of Boston. Salem, Mass. HART, C. A., and GLEASON, H. A. 1907. On the Biology of the Sand Areas of Illinois. Bull. Ill. State Lab. Nat. Hist., Vol. VII, pp. 137-272. Insect associations are discussed on pp. 220-227. Habitats are figured, and associated plants and animals are listed. [Illustration: FIG. 7.--A deciduous forest (original) as an animal habitat. The Brownfield woods, Urbana, Illinois. Photo. by H. C. Chenoweth.] HANKINSON, T. L. 1910. Ecological Notes on the Fishes of Walnut Lake, Michigan. Trans. Amer. Fisheries Soc., 1910, pp. 195-206. One of the few papers dealing with the fish associations in a lake. 1910. An Ecological Study of the Fish of a Small Stream. Trans. Ill. State Acad. Sci., Vol. III, pp. 23-31. HERMS, W. B. 1907. An Ecological and Experimental Study of Sarcophagidæ with Relation to Lake Beach Débris. Jour. Exper. Zoöl., Vol. IV, pp. 45-83. JORDAN, H. 1883. Die Binnenmollusken der nördlich gemässigten Länder von Europa und Asien und der Arktischen Länder. Nova Acta der Ksl. Leop.-Carol.-Deutschen Akad. der Naturf., Bd. XLV, Nr. 4, pp. 181-402. Halle. On pp. 201-253 there are many observations on molluskan ecology, including habitats, table of habitats of freshwater mollusks, and important observations on habitat variations or forms. Most of the paper is devoted to geographic problems. KOFOID, C. A. 1903. The Plankton of the Illinois River, 1894-1899, with Introductory Notes upon the Hydrography of the Illinois River and its Basin. Part I, Bull. Ill. State Lab. Nat. Hist., Vol. VI, pp. 95-629. The results of a prolonged, detailed study of the Illinois River plankton; capable of an associational interpretation. LINTNER, J. A. 1878. Report on the Insects and Other Animal Forms of Caledonia Creek, New York. Tenth Ann. Rep. N. Y. Fishery Comm. for 1877, pp. 12-36. One of the relatively few studies of the animals of a small stream; a census rather than an ecological study. MCCREARY, O. 1909. The Ecological Distribution of the Birds of Isle Royale, Lake Superior. Ann. Rep. Mich. Geol. Surv. for 1908, pp. 81-95. Habitat preferences of birds. MORSE, A. P. 1904. Researches on North American Acridiidæ. Carnegie Inst., Pub. 18. pp. 55. Associational groupings of the short-horned grasshoppers, with figures of habitats. RUTHVEN, A. G. 1907. A Collection of Reptiles and Amphibians from Southern New Mexico and Arizona. Bull. Amer. Mus. Nat. Hist., Vol. XXIII, pp. 483-603. Discusses the associations, habitats, and food of the desert species. SCOTT, W. 1910. The Fauna of a Solution Pond. Proc. Ind. Acad. Science for 1910, pp. 395-442. Includes a discussion of their interrelations. SIMROTH, H. 1891. Die Entstehung der Landtiere. Ein Biologische Versuch. pp. 492. Leipzig. STEUER, A. 1910. Planktonkunde. pp. 723. Leipzig.