BIBLIOGRAPHY OF U. 8. NATIONAL MUSEUM. 343 



No. 27. Directions for collecting, preserving, and transporting tortri- 

 oids and other small mollis. \\\ c 11. Fernald. 8vo. 3 pages. 



No. 28. Directions tor mound exploration. By Cyras Thomas, Ph.D. 

 svo. 3 pages. 



No. 29. Provisional plan for a collection of mammals to be exhibited at 

 the World's Industrial and Cotton Centennial Exposition of L884- 



L885, at New Oilcans. By Frederick \Y. True, curator of the De- 

 partment of Mammals. Svo. 27 pages. 



No. 30. A list of birds, the eggs of which are wanted to complete thy 

 scries in the National Museum, with instructions for collecting eggs. 

 By Capt. Charles E. Bendire, U. S. A., honorary curator, Section of 

 Oology, U. S. National Ma seam. 8vo. 4 pages. 



No. 31. Plan to illustrate the mineral resources of the United States 

 and their utilization, at the World's Industrial and Cotton Centen- 

 nial Exposition of 1884-1885, at New Orleans. By Fred. P. Dewey, 

 curator: Department of Economic Geology and Metallurgy. 8vo. 

 8 pages. 

 [Circulars 10, 20, 21, 22, and 23, which are noticed in the bibliography 



of the Museum report for 1883, as printed in u separate" form during 



that year, are reprinted in Proceedings of the U. S. National Museum, 



vi, >883, (1884), pp. 431-497.] 



