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Show 190 REV. O. P. CAMBRIDGE O N [Mar. 16, simple tubercles, w hich I believe is a perfectly natural one, was by W . Kowalevsky ; but the names were suggested to him by Prof. Owen, to whom this department of zoology owes so much. The modifications of the Buonodont forms, being beside the purpose of the present communication, have not been followed out. Finally, it may be asked what place must be assigned to the Musk- Deer in our necessarily imperfect and artificial method of expressing the relationship of living beings ? Should the genus Moschus be described as constituting a distinct family, Moschidal As I apprehend the value of the term " family," I think it should not. The characters which absolutely separate it from all the recognized Cervida, if Hydropotes is included among them, are very trifling; and to include Hydropotes with Moschus in one family, and leave all the other Cervida in another, appears to be a violation of natural affinities. It therefore appears most expedient to include them both as distinct generic modifications of the great family Cervida, recognizing of course that though a convenient it is not an absolutely perfect method of expressing their position in nature. Note to the tabular view of the Classification of Artiodactyla. The form of the odontoid process in the Tylopoda might lead to the idea that they were segregated from the Ruminant stock after the Tragulina had been given off; but as it is also found in the horse, it is probably adaptive, as are the hypsodont molars. The imion of the inner, and loss of the outer, bones of tbe metapodium is also a character not significant of very close relationship to the Pecora, as tbe tendency to this modification begins in the eariiest period of the history of the group with which we are acquainted, as in Anoplotherium, and crops out even in some of the bunodonts, as the Peccaries. 2. On some new Species of Erigone.-Part I. By the Rev. O. P. CAMBRIDGE, M.A., C.M.Z.S. [Received February 26, 1875.] (Plates XXVIl.-XXIX.) The Spiders described in the following pages are, with one exception (Erigone consimilis, p. 192), a portion of a fine collection received at various times during the past three or four years from my kind friend, Monsieur Eugene Simon of Paris. The greater part are European, and were found by M . Simon himself in France, Corsica, Sicily, and Spain ; several, however, are from Morocco and Algiers. The twenty-four new species now selected for description from M. Simon's collection all (except one) belong to the group comprised in Mr. Blackwall's genus Walckenaera ; in addition to these, nine others new to science (belonging to the genus Neriene of the same author) remain yet to be described, while the collection also contained examples of forty-four known species. Rich as the genus Erigone is at present in species, it is probable |