THE GENUS PANOPEUS. James E. Benedict and Mary J. Rathbun. Department of Marine Invertebrates. (With Plates xix-xxiv.) This paper is based upou the study of twenty-four species of Pano-peus, specimeus of all of which have been examiued by the authors. Fourteen other species and one variety, described by various writers, have not been seen by us; nevertheless, we give the synonymy and short descriptious. The material examined is contained chietly in tbe National Museum, and has been derived from the following sources : The large collections made by Mr. Henry Hemphill on the coast of Florida from 1883 to 1885; the collections of the U. S. Fish Commis-sion from the coasts of the Eastern States from 1875 to date, including those made in the investigation of the oyster grounds of Long Island "Sound ; the Fish Commission collections made in the net-work of riv'ers and creeks of the coast of South Carolina during the past season, in the West Indian region in 1884, and in the Gulf of California; the smaller collections made by Dr. Edward Palmer, Lieut. J. F. Moser, U. S. Navy, Dr. D. S. Jordan, Mr. W. H. Dall, Mr. Silas Stearns, and Mr. S. T. Walker, on the Florida coast; by Commander E. D. Evans, TJ. S. Navy, in Chesapeake Bay; by Mr. W. Nye, jr., in Buzzard's Bay ; by Mr. W. M. Gabb, in San Domingo ; by Mr. L. Belding, in the Gulf of Cali-fornia; by Mr. E. Eathbun, on the coast of Brazil, in 1875-'76; by Mr. G. Brown Goode, in Bermuda, 187o-'77. Through the courtesy of Prof. A. E. Verrill, the collection of Panopeus in the Peabody Museum of Yale University, was placed at our service, and yielded three species additional to those represented in the National Museum series. We do not agree with Prof. A. Milne Edwards in his separation of the genns into Panopeus and Uurypanopeus, for in accepting his classifica-tion depressus would be placed with forms having a lobate division of the antero-lateral margin ; crenatus and transversus, with very convex carapaces, would be placed with those most flattened ; and crenatus alone of Eurypanopeus would possess the character of the exposed seventh segment of the male sternum, and the sternal canal for the verges. Nor can we agree with Stimpsou in separating Eiirytinm from [Proceedings National Museum, Vol. XIV— Xo. 858.] 355
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