HAUSTORIIDAE OF NEW ENGLAND — BOUSFIELD 161 



spinosus Bousfield is placed in the genus Acanthohaustorius and the 

 morphological variation and geographical range of Haustorius cana- 

 densis is more fully delimited. The kno\vn and probable New Eng- 

 land haustoriid fauna now includes 20 species in 10 genera and 2 

 subfamilies. 



The following abbreviations are used throughout the figure legends : 



The writer is grateful to interested persons who collected material 

 and granted permission to examine collections used in this study. 

 Particularly helpful have been Dr. Elisabeth Deichmann, Museum of 

 Comparative Zoology, Harvard University, Cambridge, Mass.; 

 Dr. Willard Hartman, Yale Peabody Museum, New Haven, Conn.; 

 Dr. T. E. Bowman, U.S. National Museum, Washington, D.C.; Dr. 

 Roland L. Wigley, U.S. Fish and Wildhfe Service, Woods Hole, Mass. ; 

 Dr. W. D. Burbanck, Emory University, Atlanta, Georgia; and Dr. 

 Eugene H. Schmitz, formerly of the Duke Marine Laboratory, North 

 Carolina. Special thanks are due Dr. Eric L. Mills, now in the De- 

 partment of Zoology, Queens University, Kingston, Ontario, who 

 personally collected five of the species newly described and provided 

 valuable notes on the behavior and ecology of the intertidal and 

 shallow-water species of the Cape Cod region. 



The following abbreviations are used throughout the text: 



NMC National Museum of Canada, Ottawa 



MBL Marine Biological Laboratory, Woods Hole, Mass. 



USFW Uirited States Fish and Wildlife Service, Washington, D.C. 



USFC United States Fish Commission 



USNM United States National Museum, Washington, D.C. 



YPM Yale Peabody Museum, New Haven, Conn. 



Evolution and Phylogeny 



The family Haustoriidae is a relatively ancient and morphologically 

 primitive group of gammaridean Amphipoda. The para-ancestral 

 haustoriids (cf. Pontoporeia) are only slightly more specialized for 

 fossorial existence than are some members of the ultraprimitive family 

 Gammaridae (e.g., Qammarus lawrencianus) , from which stock they 



