Color. — Varying from light gray to nearly 

 black, usually commingled so as to produce an 

 irregular mottling or marbling (various authors). 



Habitat. — This species is found on shingly 

 bottoms, and not infrequently on shelly bottoms 

 in Morehead City, N.C., harbor. Its angular form 

 and coloration bear so close a resemblance to 

 fragments of shells among which it lives that it 

 is extremely difficult to detect. Two to 75 fathoms. 



Type localities. — Near Kiawah Island, Sul- 

 livans Island, and White Point Shoal, Charleston 

 Harbor, S.C. 



Known range. — Nantucket Sound, Mass., to 

 Georgia; Florida Straits to Sabine, Tex.; through 

 West Indies to St. Thomas. 



Remarks. — Ovigerous females are found in the 

 Beaufort, N.C., area throughout the summer. 



ACKNOWLEDGMENTS 



Considerable aid was provided for completing 

 this revision. The Society of the Sigma Xi gave 

 a grant-in-aid to help with curatorial duties in 

 the Institute of Fisheries Research Collection. 

 National Science Foundation gave two grants 

 (G-5638 and G-18545) for study, travel, cura- 

 torial expenses, and illustration. Without these 

 grants, the work would not have been possible. 



Fenner A. Chace, Jr., Senior Scientist, Depart- 

 ment of Zoology, U.S. National Museum, gave 

 encouragement and counsel, and aided greatly by 

 providing space for study at the USNM, and by 

 loaning specimens. G. Robert Lunz, Director, 

 Bears Bluff Laboratories, Wadmalaw Island, S.C, 

 extended similar help; and E. Milby Burton, 

 Curator, The Charleston Museum, provided study 

 space and made loans of specimens. L. B. 

 Holthuis, Rijksniuseum van Natuurlijke Historie, 

 Leiden, gave counsel and many kindnesses. My 



associates, A. F. Chestnut, E. E. Deubler, W. E. 

 Fahy, W. A. Lund, H. J. Porter, G. S. Posner, 

 and W. J. Woods, helped with many details; and 

 my colleagues in nearby laboratories of the U.S. 

 Fish and Wildlife Service, Bureau of Commercial 

 Fisheries and Duke University, Beaufort, N.C., 

 provided botli field data and other help. 



Special thanks are due my assistant, George W. 

 Bryce, Jr., .who did much of the curatorial and 

 photographic work, and the able artist, Doris H. 

 King, who drew all original figures except the 

 map. 



Figures copied from source material are 

 credited to authors in the text. Publishers, in- 

 stitutions, and journals who kindly gave permis- 

 sion to reproduce these figures are: American 

 Museum of Natural History; Bingham Oceano- 

 graphic Laboratory; Biological Bulletin; British 

 Museum (Natural History) ; Caraibisch Marien- 

 Biologisch Instituut, Curasao; Charleston Mu- 

 seum ; Connecticut Academy of Arts and Sciences; 

 Institut Oeeanographique, Monaco; Koninklijke 

 Nederlandse Akademie van Wetenschappen, 

 Amsterdam; John Murray, London; Journal of 

 the Elisha Mitchell Scientific Society; Marine 

 Laboratory, University of Miami; Martinus 

 Nijhoff, The Hague; Museum of Comparative 

 Zoology, Harvard University; National Museum 

 (formerly Raffles Museum), Singapore; New 

 York Academy of Sciences ; New York Zoological 

 Society; Pennsylvania Academy of Sciences; 

 Rijksmuseum van Natuurlijke Historie; Smith- 

 sonian Institution, LT.S. National Museum; Texas 

 Academy of Science; U.S. Fish and Wildlife 

 Service, Bureau of Commercial Fisheries; Uni- 

 versitetets Zoologiske Museum, Copenhagen; Uni- 

 versity of Southern California, Allan Hancock 

 Foundation; Washington Academy of Sciences. 



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FISH AND WILDLIFE SERVICE 



