262 



REPORT ON NATIONAL MUSEUM. 



or the Mississippi Valley and Atlantic area, 

 species, as follows : 



It embraces over 1,200 



Potsdam sandstone. . 



Ohazy limestone 



Quebec 



Trenton limestone. . . 



Utica slate 



Hudson River group , 

 Medina sandstone . . . 

 Clinton group 



Species. 

 25 

 13 

 8 

 86 

 24 

 76 

 8 

 46 



Niagara group 186 



5 



84 



37 



1 



33 



Onondaga salt group 



Lower Helderberg group . . 



Oriskany sandstone 



Caudagalli grit 



Schoharie grit 



Species. 



Upper Helderberg 89 



Marcellus shale 16 



Hamilton group 196 



3 



6 



5 



73 



2 



25 



128 



46 



Tully limestone 



Genesee slate . 



Portage group 



Chemung group 



Catskill group 



Waverly group 



Lower Carboniferous 

 Coal-measures 



Total 1,221 



Another important addition is that of the collection of the Fortieth 

 Parallel Exploring Expedition. This includes representations of up- 

 wards of one hundred species, many of which are types. This collection 

 has not been recorded. 



Mr. U. P. James presented the Museum with a series of typical speci- 

 mens representing seventy-eight species, described by him, from the 

 Hudson River group of Ohio. 



Owing to the pressure of work in connection with the preparation of 

 a report on the Paleontology of the Eureka Mining District, Nevada, I 

 have not been able to give much time to arranging and classifying the 

 collections except as incidental to that work. 



The study of the collections of the U. S. Geological Survey is prepar- 

 ing a large amount of valuable material that will only need to be re- 

 corded in the records of the Museum, to form the nucleus of a large col- 

 lection from the regions of the Rocky Mountains. In my next annual 

 report I hope to give a list of the genera and species in this collection. 



During the year no publications were made upon material recorded. 

 A short paper in Science (vol. xi, p. 808) notices the discovery of fresh- 

 water shells from the Lower Carboniferous of Central Nevada, the types 

 of which are now in my hands. 



The present state of the collections maybe briefly stated : Ten standard 

 cases of drawers containing about 20,000 specimens, representing nearly 

 1,800 species. These are arranged in stratigraphic order, and within 

 that a zoologic arrangement is more or less clearly defined. This col- 

 lection includes the Smithsonian collections and those of the various 

 Government surveys, up to the time of the organization of the present 

 Geological Survey. I found it without systematic arrangement, on 

 taking charge in May, 1883, and have given most of the time T could 

 spare from paleontologic work in connection with the Geological Survey, 

 to arranging it, and also in getting the laboratory rooms fitted up. The 



