CONTENTS. PAGE 1 IV. On the Development of some Pelagic Fish Eggs.— Preliminary Notice. By ALEXANDER AGASSIZ and C. O. WHITMAN . V. The External Morphology of the Leech. By C. O. WHITMAN VI. On the Anatomy and Histology of Aulophorus Vagus. By VII. Descriptions of New Species of Cambarus; to which is added a 8888 XIII. Notes on some Species of Gymnosporangium and Chrysomyza of the United States. By W. G. FARLOW XIV. Contributions to American Botany. By SERENO WATSON. 324 XV. An Examination of the Standards of Length constructed by XVIII. A Photographic Study of the Nebula of Orion. By EDWARD XIX. Relation between Superficial Energy and Thermo-Electricity. On the Separation of Titanium and Aluminum, with a Note on the Separation of Titanium and Iron. By F. A. Gooсн 435 The Effect of Temperature on the Magnetic Permeability of A REVISION OF THE NORTH AMERICAN SPECIES BY ASA GRAY. Communicated May 14th, 1884. In the sixth volume of the Proceedings of the American Academy (1863), as an appendix to a revision of Astragalus, I made an attempt to classify and characterize our comparatively few species of Oxytropis. In the autumn of 1880, I compared our own materials with those in the Kew herbarium, but, unfortunately, without knowing of Bunge's Species Generis Oxytropis, which was communicated to the Imperial Academy of Sciences of St. Petersburg in November, 1873, and published in its Mémoires, Ser. VII. Vol. XXII., in 1874. Bunge cites my notes, but he had not the means for clearing up the obscurities. Even now, after some examination of most of the originals, I can only partially remove them. But the subjoined synopsis may fairly represent our present knowledge. OXYTROPIS, DC. § 1. Caulescens, nunc subcaulescens; stipulis inter se et a petiolo liberis: legumen uniloculare calycem longe superans. Subgen. Phacoxytropis § Mesogææ, Bunge. 1. O. DEFLEXA, DC. O. foliolosa, Hook. (O. foliosa, in Torr. & Gray, Fl.), forma subacaulis. Saskatchewan, and along the Rocky |