80 REPORT OF NATIONAL MUSEUM, 1903. 



continued work on a monoorapli of the fresh-water crabs, based on the 

 collections of the National Museum, the Museum d'Histoire Naturelle, 

 Paris, th(; Museum of Comparative Zoology, Harvard University, and 

 other institutions. She also published live short papers on crusta- 

 ceans during- the year, one of which, describing new Hawaiian crabs, 

 appeared in the Museum Proceedings. Dr. Harriet liichardson pub- 

 lished descriptions of two new isopods. Two papers on crustaceans 

 collected in and near Mammoth Cave and Nickajack Cave, by Prof. 

 W. P. Hay, were published by the Museum. 



Dr. Charles B. Wilson completed his study of the collection of 

 North American copepod crustaceans of the family Argulidaj, the 

 results of which were pu])lished by the Museum as Proceedings paper 

 No. 1302. It occupies 107 pages, and includes a review of all the 

 species of the family and a bibliography, and is accompanied by 20 

 plates. 



Dr. C. W. Stiles, Custodian of Helminthological Collections, made 

 an extended investigation of a parasitic disease prevalent among the 

 people of the Southern States, which he found to be due to the attacks 

 of a new species of hookworm, TJncinariaamericana. He also carried 

 on investigations regarding frequency of the occurrence of parasites 

 in men. He published nine papers relating- to parasitology during 

 the year and three others along the same line conjointl}^ with Dr. 

 Albert Hassall and Mr. Charles A. Pfender; also the first three parts 

 of an index catalogue of medical and veterinary zoology, Doctor Has- 

 sall l)eing a coauthor. The statf of the National Herbarium was too 

 fully occupied during the j^ear with routine work and the rearrange- 

 ment of the collections to devote a great deal of time to investigations. 

 A third section of Doctor Rose's studies of Mexican and Central 

 American plants was published, and a paper in joint authorship with 

 Mr. W. B. Hemsley on the genus Julian la. He continued work on 

 the Crassulacese of North America conjointly with Doctor Britton, 

 and completed a preliminary paper relating to that group of plants. 

 Mr. C. L. Pollard published a number of notes in the Plant World, 

 and described two new violets from the United States. He also pub- 

 lished conjointly with Mr. T. D. A. Cockerell descriptions of four 

 new plants from new Mexico. Mr. W. R. Maxon continued studies on 

 the Museum collection of ferns, and Mr. Edward S. Steele completed 

 a monograph of the genus Laclnaria. 



EXPOSITIONS. 



As stated in the last report, a part of the collections displayed at 

 the Pan-American Exposition at Buti'alo, 1901, were later transferred 

 to the Charleston Exposition, which closed May 31, 1902. The 

 exhibit made at the latter place was returned to Washington in June. 



