506 THE CHICAGO ACADEMY OF SCIENCES. 



1902. Geology of Mills and Fremont Counties. Geol. Surv. Iowa, XIII, 



pp. 123-183. 

 Ulffers, H. A. 



1855. Mollusca of. Southern Illinois. Trans. 111. State Ag. Soc., I, 1853-54, 



pp. 610-612. 

 Ullyett, Henry. 



1886. Note on Limnsea stagnalis. Science Gossip, XXII, p. 214. 

 Upham, Warren. 



1895. The Glacial Lake Agassiz. Monograph, XXV, U. S. Geol. Surv. 

 Valenciennes, M. A. 



1833. Coquilles Univalves Terr, et Fluv., etc., Recueil d'Observations de 



Zoologie et d' Anatomic Comparee, etc., II. 

 Vaughan, T. Wayland. 



1893. Notes on a Collection of MJollusks from Northwestern Louisiana, and 

 Harrison County, Texas. Amer. Nat, XXVII, pp. 944-961. 



Verrill, A. E. 



1871. See Smith, S. I. 



1873, a. Remarks on Certain Errors in Mr. Jeffrey's Article on "The Mol- 

 lusca of Europe Compared with Those of Eastern North America." 



Ann. Mag. N. H., iv, XI, p. 206. 

 1873, b. Remarks on Certain Errors in Mr. Jeffrey's Article on "Mollusca 



of Europe Compared with Those of Eastern North America." Amer. 



Journ. Sci. (iii), V, pp. 465-472. 

 Wailes, B. L. C. 



1854. Report on the Agriculture and Geology of Mississippi, Embracing a 



Sketch of the Social and Natural History of the State. Invertebrate 



Fauna, pp. 336-339. 

 Walker, Bryant, and Beecher, Chas. 



1876. List of Land and Fresh-water Shells Found Within a Circuit of Four 



Miles about Ann Arbor, Mich. Proc. Ann Arbor Sci. Asso., p. 43. 

 Walker, Bryant. 



1879. Catalogue of the Shell-bearing Mollusca of Michigan. Journ. Conch., 



II, p. 325. 

 1892-3. The Shell-bearing Mollusca of Michigan. Nautilus, VI, pp. 31-36, 



July, 1892; pp. 135-141, April, 1893. 



1894, a. Shells of the Saginaw Valley, Michigan. Nautilus, VII, pp. 125- 



129. March. 



1894, b. Review of Our Present Knowledge of the Molluscan Fauna of 



Michigan. Privately printed, 1894. Read before the Michigan Acad- 

 emy of Science, Dec. 27, 1894. 



1895. A Month with the Michigan Fish Commission. Nautilus, IX, pp. 

 2-6. May. 



1898. Mollusca Contemporaneous with the Mastodon. Nautilus, XI, pp. 

 121-122. March. 



1899. Station of Limnaea Gracilis. Nautilus, XII, pp. 119-120, February; 

 p. 131, March. 



1900. a. Note on the Habits of Limnsea Mighelsi W. G. Binney. Nautilus, 



XIV, pp. 8-9. May. 



