2 BULLETIN 2 01, UNITED STATES NATIONAL MUSEUM 



Fish Hawk and Bache investigations along the Atlantic coast of the 

 United States, the Gulf Stream, and Puerto Rican waters; and the 

 Johnson-Smithsonian Deep-Sea Expedition to the Puerto Rican Deep 

 of 1933 and the waters en route. 



This paper is designated to fulfill four purposes: 



1. To describe and record the species in the collections of the United 

 States National Museum submitted to me. This is, of course, the 

 primary purpose of the report, and I have included all the material 

 that I have received from any part of the world.* 



2. To provide as complete a guide as possible to the species of 

 Mysidacea in the collections of the United States National Museum, 

 of which the Albatross Philippine collections of 1907-1910 form a 

 not inconsiderable part. 5 To that end I have included all the named 

 material in the National Museum, and in those cases where I have 

 not personally examined the material I have given the authority for 

 the identification wherever that information is available. Such col- 

 lecting records are indicated by an asterisk. 



3. To provide an introduction to the mysidacean fauna of the Amer- 

 ican continents, including Canada, the United States, Central Amer- 

 ica, South America, and the American islands, both in the Atlantic 

 and Pacific. For this purpose I have included all the species ever 

 recorded from the American faunal area whether or not they are 

 represented in the Museum collections. Species of which no speci- 

 mens are included in the United States National Museum collections 

 are grouped beginning on page 242. Under each species, I have given 

 references to the literature, and I hope this information may form a 

 useful basis for future work on the American Mysidacea. 6 



4. To provide as complete a list as possible of all the papers dealing 

 with American species in any way whatever. I have tried to make 

 this list complete, and, though it is too much to hope that no paper has 

 been omitted, I believe it forms a full guide to the Amer- 

 ican literature. 7 



I am indebted to the authorities of the United States National Mu- 

 seum, especially to the late Dr. Mary J. Rathbun and to Dr. Waldo L. 

 Schmitt, for their cooperation. 8 



• A list of new genera and species will be found on page 250. 



• Albatross Philippine species are indicated in the Contents by a "P." 



• Species indicated in the Contents by an "A" are American. 



7 Those papers included in the Literature Cited, p. 263, that deal with American species 

 are annotated. 



8 The acknowledgments made by the author should be extended to include Dr. Fenner 

 A. Chace, Jr., and Paul L. Illg, of the Division of Marine Invertebrates. U. S. National 

 Museum, for clearing up a few technical points, and especially to Miss Gladys O. Visel, 

 of the Editorial Division, Smithsonian Institution, for her invaluable services in prepar- 

 ing the manuscript for the printer. — Ed. 



