38 SIXTEENTH REPORT. 



beyond which it is 1 m.; the latter only shown in depression behind outer 

 spit, in the upper, left hand corner of the map. Sciuares, shown only on 

 land, 25 m. each way. H. P. L., Hook Point Lagoon. Dashes indicate dis- 

 tribution of Scirpus americanus. 



Map 9. Sedge Point and Sedge Point Pool; made August 1, 1912. 



Contour interval, showing depths of water, 10 cm., out to depth of 1 m.; 

 no contours shown beyond that depth; 10 cm. contour omitted, except in 

 pool. Squares, shown only on land, 25 m. each way. Dashes indicated dis- 

 .tribution of Scirpus americanus; dots of Scirpus validus. Broken line in- 

 dicates margin of trees. The line inside the shore-line represents the high 

 water mark for that vear, about 20 cm. above level when map was drawn. 

 ,S. P. P.; Sedge Point Pool. 



BIBLIOGRAPHY. 



(1). F. C. Baker: "The Ecology of the Stokie Marsh Area, with Special 

 Reference to the Mollusca:' Bull, of the 111. State Lab. Nat. Hist.; vol. 

 VIII, art. IV, 1910. 



(2). Ibid: '^Lymnaeidae of N. and M. America, Recent and Fossil". 

 Special Pubhcation No. 3, Chicago Acad. Sci., 1911. 



(3). Ibid. "Alolluscan Fauna of Tomahawk Lake, Wis." Trans. AVis. 

 Acad. Sci., Arts and Letters, vol. XVII, pt. 1; pp. 200-246; 1911. 



(4). H. Burrington Baker. "Variation in Lymnaea reflexa Sav, from Huron 

 County." 12th Rept. Mich. Acad, of Sci.; pp. 60-63; 1910. 



(5). Ibid. "Mollusca," in "A Biol. Surv. of the Sand Dune Region on 

 the South Shore of Saginaw Ba.y, Mich." Mich. Geol. and Biol. Surv.; 

 Publ. 4; Biol. Series 2; pp. 121-176; and Plates, especially in this connection: 

 II-B, VIII, XII, and XIII-A; 1911. 



(6). Ibid. "A Few Notes on the Mollusca of the Douglas Lake Region." 

 14th Rept. Mich. Acad. Sci., pp. 209-211; 1912. 



(7). Ibid. MSS. "Mollusca of Dickinson County;" finished in 1912; 

 work done in summer of 1909; to be published by Mich. Geol. and Biol. 

 Surv.; used with permission of the Director of the Biol. Surv. 



(8.) E. A. Birge. "The Thermocline and its Biological Significance." 

 Trans. Amer. Microsc. Soc, vol. XXV, pp. 5-33; 1904. 



(9). E. A. Birge, and C. Juday. "Inland Lakes of Wisconsin. The Dis- 

 solved Gases of the Water and their Biological Significance." Wis. Geol. 

 and Nat. Hist. Surv., Bull. No. 22, pp. 259. 



(10). Gilbert. "Topographic Features of Lake Shores." 5th Ann. Rept. 

 U. S. Geol. Surv.; 1885. 



(11). A. C. Lane. "Summarv of the Surface Geology of ^Michigan;" 

 Rept. State Board of Geol. Surv. of Mich, for 1907. 



(12). Frank Leverett. "Outline of the Historv of the Great Lakes." 

 12th Rept. Mich. Acad. Sci. pp. 35-39; 1910. 



(13). Victor Shelf ord. "Animal Communities in Temperate America, as 

 Illustrated in the Chicago Region. A Study in Animal Ecology." The 

 Geog. Soc. of Chicago; Bull. No. 5; 1913. 



(14). David A. Tucker, Jr. "The Oxygen Content of the Waters of 

 Douglas Lake, Michigan." 15th Rept. Mich, Acad. Sci., pp. 121-128; 

 1913. 



