1874.] SENATE— No. 200. 21 



Robt. Drinkwater, 65 specimens of English coal-measure fossils, 

 including some very interesting fish-remains. 



J. M. Allen, in exchange, 25 specimens of Dictyophyton, from 

 the Chemung of New York. 



W. R. Limpert, 20 specimens, representing 10 species of creta- 

 ceous fishes and molluscs, from Central Kansas. 



O. St. John, four cases of miscellaneous fossils, from the Creta- 

 ceous, Upper and Lower Carboniferous and Devonian formations, 

 Western States. 



By Purchase. 



Mr. Charles Wachsmuth, the magnificent collection of fossil 

 crinoids, the result of fifteen }'ears' arduous research, together with 

 a miscellaneous general collection of foreign and American fossils. 



C. D. Walcott, a collection of Lower Silurian fossils, including 

 a valuable collection of Trenton Trilobites, from Trenton Falls, 

 New York. 



Richard Rathbun, local collection of the fossils of the Hamil- 

 ton and Chemung formation, Central and Western New York. 



Professor Hyatt has been engaged in arranging the collec- 

 tion of fossil Cephalopods. 



Dr. Maack, who has had charge of the Fossil Vertebrates, 

 died during the last summer, from disease contracted while in 

 the Isthmus of Panama. His attainments in his special de- 

 partment were very considerable ; by his devotion to his work 

 he was gradually bringing the collections under his care into 

 excellent order. By his untimely death the Museum loses an 

 efficient ally. 



