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8. 32 Charles Jovey Simpson. The classification and geographical distribution of the Pearly Freshwater Mussels. [[strikethrough]] By [[/strikethrough]] Proc. U.S. Nat. Mus. XVIII, No. 1068, May [strikethrough]] 20 [[/strikethrough]] 19th 1896, pp. 295-343, [[strikethrough]] with [[/strikethrough]] pl. ix. This paper briefly reviews the history of the classification of the Naiades and proposes a new one in part, based on all the characters, but more especially on those of the hinge and embryos. Those genera which have [[taxodout?]] teeth or vestiges of them, and pass through a larval stage called Lasidium are placed. in the family Muelidae, while those having Schizodout teeth or their vestiges, and which pass through a Slochidium stage are put in the Unionidae and the families and genera are defined It is held that the Naiades are distributed in Either regions of provinces, viz, Ethiopian, Palearctic, Oriental and Australian in the Old World; a part of the Paleartic region, the Mississippi, Atlantic, Central American, and Neo-tropical provinces in the New World. The paper is general and based on Museum material only in a general way. N.A. Pilsbry. A remarkable Central American Melanian, [[strikethrough]] by [[/strikethrough]] Proc. Aead. Nat. Sci. Phila., [[strikethrough]] br [[/strikethrough]] 1896, pp. 269, 270. This is a description of a remarkable species of [[Pachychiclus??]] in which the adult has the outer lip sinuous, somewhat is in melanatira. The types from the Tehuantepee region are in the National Museum.