. A final report on the Crustacea of Minnesota, included in the orders Cladocera and Copepoda, together with a synopsis of the described species in North America, and keys to the known species of the more important genera . result of careful study of large series from different locali-ties. The sketches illustrating this paper are photo-printed fromthe writers own drawings, and, without the elegance of litho-graphs, serve the purpose of explaining points of structure whichcannot be communicated verbally. I am indebted to Prof. A. for very timely aid in bibliography, without which thep
. A final report on the Crustacea of Minnesota, included in the orders Cladocera and Copepoda, together with a synopsis of the described species in North America, and keys to the known species of the more important genera . result of careful study of large series from different locali-ties. The sketches illustrating this paper are photo-printed fromthe writers own drawings, and, without the elegance of litho-graphs, serve the purpose of explaining points of structure whichcannot be communicated verbally. I am indebted to Prof. A. for very timely aid in bibliography, without which thepaper could not have been completed. To Dr. Lindthal, throughmy friend Mr. Oe&tlund, I am indebted for a like service. But myobligation is (ftepest to Prof. Rudolph Leuckart of Leipzig, whokindly afforded access to almost a complete set of works on Euro-pean entomostraca. Prof. C. W. Hall has collected at muchexpenditure of time and labor a set of specimens from differentparts of the state which he kindly placed in my hands, thus en-abling me to observe the great similarity of widely-separatedfaunae. Mr. Lieberg also sent specimens of Diaptomus stagnalisfrom saline pools in Dakota. STATE GEOLOGIST. INTRODUCTORY,. Evading een the microscopic eje, Full nature swarms witli life ; one wondrous mass Waitintc the vital breath, when Parent Heaven Shall bid the spirit blow. The hoary fen, In putrid streams, emits the living cloud Of pestilence. Through subterranean cells, Where searching sunbeams scarce can And a waj, Earth animated heaves. The flowery leaf Wants not its soft inhabitants. Secure Within its winding citadel, the stone Holds multitudes. * * where the pool Stands mantled oer with green, invisible Amid the floating verdure, millions stray. * * Nor is the stream Of purest crystal, nor the lucid air. Though one transparent vacancy it seems, Void of their unseeu people.—Couper. To the poet only, and the man of science, is it given to meetthese unseen people on those familiar
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