On some Palæozoic Ostracoda from Westmoreland

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§1. Introduction In 1865 the Author determined for Prof. Harkness some fossil Ostracoda which he had obtained from the Lower-Silurian rocks of S.E. Cumberland and N.E. Westmoreland, and subsequently other specimens mentioned by Harkness and Nicholson in 1872. In 1891 Prof. Nicholson and Mr. Marr submitted a series of similar microzoa from the same district; and the Author now endeavours to determine their specific alliances, and revises the list of those previously collected. He has to notice about eleven forms of Primitia, Beyrichia, Ulrichia, Æchmina , and Cytherella —several of them being closely allied as varieties, but all worthy of study as biological groups, such as have been illustrated from other regions by writers on the Ostracoda, with a view to the exact determination, if possible, of species and genera, of their local and more distant or regional distribution, and of their range in time. §2. References to Figures and Descriptions of Groups of Mutually-related Ostracoda of Palæozoic Age 1. J. Barrande . Syst. Sil. Bohême, vol. i. Supplem. 1872. Various. 2. Fr. Schmidt . Mém. Acad. Imp. Sc. St.–Pétersbourg, sér. 7, vol. xxi. 1873, Leperdiœ; ibid. vol. xxxi i . 1883, Leperditiœ . 3. G. Reuter . Zeitschr. Deutsch. geol. Gesellsch. vol. xxxvii. 1885, pp. 621-679, pls. xxv., xxvi. 4. M. Verworn . Ibid . vol. xxxix. 1887, pp. 27-31, pl. iii. 5. J. Kiesow . Ibid . vol. xl. 1888, pp. 1-16, pls. i., ii. ; Jahrb. Geol. Landesanst. u. Bergakad. Preuss. 1889, pp. 80-103, pls. xxiii., xxiv. 6. A. Krause . Zeitschr. Deutsch. geol. Gesellsch. vol. xli. 1889

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