ACKNOWLEDGMENTS 



Many individuals and institutions in the United 

 States, Latin America, and Europe provided the 

 extensive material for this work. Most of the fol- 

 lowing institutions lent collections or permitted 

 me to examine specimens : Academy of Natural 

 Sciences of Philadelphia (PANS) ; xVmerican 

 Museum of Natural History (AMNH) ; Bureau of 

 Commercial Fisheries Biological Laboratory, Gal- 

 veston (BCFBLG) : Chesapeake Biological Lab- 

 oratory (CBL) ; Centro de Investigaciones 

 Pesqueras, Cuba (CIP) ; Centro de Pesquisas de 

 Pesca, Estado de Santa Catarina. Brazil 

 (CPPSC) ; Instituto Nacional de Investigaciones 

 Biologico-Pesqueras, Secretaria de Industria y 

 Comercio de Mexico (INIBP) : Gulf Coast Ee- 

 search Laboratory (GCRL) ; Museum National 

 d'Histoire Naturelle, Paris (MNHNP) ; Museum 

 of Comparative Zoology, Harvard University 

 (MCZ) ; State of New York Conservation Depart- 

 ment (NYCD) ; Peabody Museum of Natural 

 History, Yale University (YPM) ; Florida State 

 Board of Conservation, St. Petersburg Marino 

 Laboratory (SPIML) ; Superintendencia doDesen- 

 volvimento da Pesca, Rio de Janeiro-Estado da 

 Guanabara (SITDEPE) : United States National 

 Museum (USNM) ; Laiiversity of Miami Marine 

 Laboratory (LTMML) ; University of the West In- 

 dies, Trinidad (LTWI) ; and the Vanderbilt Marine 

 Museum (VMM). A collection from Mexican 

 waters has been divided, and one part, deposited at 

 the INIBP and the other at the USNM ; this col- 



lection is indicated in Study Matei'ial by USNM- 

 INIBP. 



Horton H. Hobbs, Jr., gave me his interest and 

 encouragement and critically read the manuscript ; 

 Fenner A. Chace, Jr., assisted in problems in sys- 

 tematics; Milton J. Lindner and Josepli H. Kut- 

 kuhn commented on the manuscript ; and Willard 

 D. Hartman lent me the penaeid collection from 

 the Peabody Museum of Natural History after 

 liaving it reexamined and cataloged and thereby 

 sa\ed me much time in the identification of pre- 

 viously studied critical material. The names of the 

 many colleagues here and abroad who collected 

 and sent specimens appear under the headings 

 "Study Material." Mauro Cardenas and Hector 

 Chapa Saldaha, of the Instituto Nacional de In- 

 ^'estigaciones Biologico-Pesqueras, Mexico, made 

 available to me much critical material from the 

 Mexican Coasts. Two friends, Eomulo Almeida 

 and Mario C. Filippi, helped collect shrimp in 

 areas wliere no commercial shrimping takes place. 

 Harvey E. Bullis, Jr., made available the invalu- 

 able collections from the Oregon and Silver Bay 

 expeditions, without which little progress could 

 have been made in reaching a number of conclu- 

 sions on the geographic and bathymetric distribu- 

 tion of members of the group. 



Maria M. Dieguez was the illustrator. 



Tlie present project was carried out with the 

 support of the National Science Foundation 

 (Grant No. GB-3907) , the Eadcliffe Institute, and 

 the Bui'eau of Commercial Fisheries. 



