A REVIEW OF THE MYSIDACEA OF THE 

 UNITED STATES NATIONAL MUSEUM 



By Walter M. Tattersall. : 



INTRODUCTION 



The Mysidacea included in this report form the largest individual 

 collection of these crustaceans that has passed through the hands of 

 a single worker. Included are 120 species, of which 19 species and one 

 variety are described as new. There are included many interesting 

 and rare species that have provided opportunity for the elucidation of 

 obscure points in mysidacean morphology and classification. The 

 greater part of the collection is of American origin, and it adds enor- 

 mously to existing knowledge of the Mysidacea of the American Con- 

 tinent, both in shallow and deep water. It is particularly rich in the 

 littoral species of Neomysis and Acanthomysis from the coasts of the 

 North Pacific, both American and Asiatic, and I have been able to 

 clear up the relationships of many obscure species from that area. 

 The work of the United States Fish Commission, through its research 

 vessels, especially the Albatross, resulted in considerable additions 

 being made to our knowledge of the deep-water and oceanic species on 

 both sides of the continent. This knowledge is particularly valuable 

 in the Pacific, from which relatively scanty material has hitherto been 

 available. 



The principal expeditions of which the Mysidacea are here dis- 

 cussed include the various explorations of the Albatross in the Atlantic 

 and Pacific waters of America and the Philippine Islands in 1907-1910 

 and the biological survey of San Francisco Bay in 1912 and 1913 3 ; the 



2 Dr. Walter M. Tattersall, professor of zoology and comparative anatomy, University 

 College, Cardiff, Wales, died on October 1, 1943. For an obituary notice see "Professor 

 W. M. Tattersall," by Stanley Kemp, Nature, vol. 152, p. 592, November 20, 1943. — Ed. 



8 1 reported on this material in University of California Publications In Zoology, vol. 37, 

 pp. 315-347, 1932. However, as complete lists of stations at which the various species 

 were taken were not included in that paper, they have been given herein with the num- 

 ber of specimens taken at each station. In some instances the counts are approximations, 

 as much of the material dried out while in storage at the university. The data for the 

 San Francisco Bay stations are given in University of California Publications in Zoology, 

 vol. 14, pp. 1-198, 1914. 



As it may be of some interest a complete list of the species collected by the United 

 States Fisheries steamer Albatross expedition to the Philippine Islands, 1907-1910, has 

 been made a part of the Contents, such species being followed by the letter "P." All these 

 species are represented in the collections of the United States National Museum. 



