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20 [[left margin]] Dall [[/left margin]] above the sea; and that they have since, during a period of emergence, reached their present elevation. That the land-snail fauna of the Lesser Antilles is closely related to that of South America, and that there is no evidence that the Lesser Antilles have ever been united to the Greater Antilles. These deductions are drawn largely from biological evidence. Types of Anodonta dejecta rediscovered, by Chas J. Simpson. [The Nautilus, VIII, no 5, Sept. 1894, pp. 52-53] [[left margin]] (20) [[/left margin]] The types of Anodonta dejecta, Lewis, which were in the National Museum collection, were rediscovered by the writer in examining some duplicate material, and prove to be the same as his A. mearnsiana from the Pacific drainage. The locality, Head of Arkansas River", given for Lewis's types is, no doubt, erroneous. Patella (Helcioniscus) nigrisquamata, live, by, Chas J. Simpson. [The Nautilus, VIII,No 8, Dec. 1894, pp. 91-92] [[left margin]] (21) [[/left margin]] The writer shows that the shellnamed Patella boninensis by Pilsbry is only an adult form of P. nigrisquamata, named long ago by Reeve. Note on Unio oregonensis, Lea, by Chas. J. Simpson. [The Nautilus, VIII, no 10, Feb. 1895, pp. 116-118.] [[left margin]] (22) [[/left margin]] The four type specimens of U. oregonensis, Lea, are the only ones known and, the writer in carefully comparing them with other species, discovered