J.6 SEVENTH REPORT. 



68. Natural History Notes from the Hawaiian Islands. 



(a) Role of Mucus in Corals 1 t -o T^ j a a i 



(b) Commensalism of Crab and Actinian / ^- ^- ^uerden, Ann Arbor. 



69. The Value of the Pedicellarite in the Taxonomy of Sea-urchins. Hubert Lyman 



Clark, Olivet College. 



70. The Static Function in Some Crustacea, (15 minutes). L. Murbach, Detroit. 



71. An Ecological Study of Physa. Miss Jean Dawson, Ann Arbor. 



72. Light Reactions of Stentor, (30 minutes). S. O. Mast, Hope College. 



73. The Reflex Theory of Phototaxis. S. J. Holmes, Ann Arbor. 



74. Variation in the Blue Racer, (15 minutes). C. C. Whittaker, Olivet College. 



75. The Nervous System of Coenopsammia. Miss S. A. Ayres. Ann Arbor. 



76. Some Results of a Study of Variation in Paramecium. Raymond Pearl and Frances 



J. Dunbar, Ann Arbor. 



77. Some Results of a Study of Correlation in the Crayfish. A. B. Clawson, Ann Arbor. 



78. Demonstration of Hawaiian Corals. J. E. Duerden, Ann Arbor. 



79. The University Museum Expedition to Northern Michigan. 



a. Introductory Remarks. Charles C. Adams, Ann Arbor. 



b. An Ecological Survey in the Porcupine Mountains and Isle Royale. A. 



G. Ruthven, Ann Arbor. 



c. Ecological Distribution of the Birds of the Porcupine Mountains. Otto 



McCreary, Ann Arbor. 



d. Annotated List of the Molluscs of the Porcupine Mountains and Isle Royale. 



Bryant Walker and A. G. Ruthven, Detroit and Ann Arbor. 



e. Annotated List of the Birds of the Porcupine Mountains. 



N. A. Wood, M. M. Peet, and O. McCreary, Ann Arbor and Ypsilanti. 



f. Annotated List of the Birds of Isle Royale. 



N. A. Wood, M. M. Peet, and O. McCreary, Ann Arbor and Ypsilanti. 



80. The distribution of Polygyra in Michigan. 



Bryant Walker, Detroit. 



81. The Ophidia of Michigan. Frank N. Notestein, Alma College. 



82. A Sinnmarv of the Work hitherto done on Michigan Herpetology. 



Morris Gibbs, Olivet College. 



83. The Distribution of the Blue Racer and Rattlesnake in Michigan. (With maps. 



10 minutes.) 



Hubert Lyman Clark, Olivet College. 



84. A Provisional List of the Amphibia and Reptilia of Michigan. (15 minutes). 



Morris Gibbs, H. L. Clark, and Frank N. Notestein, Olivet College and Alma College. 



85. The Status of Entaemia Brachystoma. 



C. C. Whittaker, Olivet College. 



86. Variation of Land and Water Temperatures. W^. F. Cooper, Lansing, Mich. 



87. Climatic Centers and Centers of Plant Distribution. E. N. Transeau, Alma, Mich. 



