88 
Rowland M. Shelley 
ACKNOWLEDGMENTS.— I thank Richard I. Johnson, Museum 
of Comparative Zoology, for assistance with the determinations, and 
Hugh J. Porter, University of North Carolina Institute of Marine Scien- 
ces, and Andrew Gerberich, National Museum of Natural History, 
Smithsonian Institution, for comments on preliminary drafts of the 
manuscript. The photographic plates were prepared with the assistance 
of Daniel J. Lyons, North Carolina State Museum Exhibits Section. 
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