On the Classification of ^trds, lOl inaequilateral, umbones prominent, oblong in form, being somewhat produced posteriorly; the ligament is external; teeth in right valve apparently three, in the left two, all cardinal ; inner surface subpellucid, white ; pallial line with a conspicuous sinuosity. Several examples, but only a very few in mature condition. EXPLANATION OF THE PLATES. Pla-te I. Fiff. 1. Nassa (Hima) ischna. Fig. '2. Drillia theoreta. Fig, 3, Mangilia chilosema. Fig. 4. galigensis. Fig. 5. perlonga. Fig. 6. fheskeloides. Fig. 7. Clathurella G'Maleyi. Fig. 8. Lnfirus (Perisfernia) pagodcefonnis. Fig. 9. Erato olivaria. Fig. 10. Scalaria {Cirsofremn) hidryma. Fig. 11. (Constanti(i) Standeni. Fig. 12. Ceritluopsis {Seila) bandorensis, Melv. Fig. 13. Actmopyramis Psyche. Fig. 14. Odostomia eutropia. Fig. 15. Pgrgiilina epentromidea. Fig. 16, glycisma. Plate II. Fig. 1. Fusi/s Toicnsendi. Fig. 2. Mifra (Pusin) Elizte. Figs. 3, 3 «. Mitra {Costellaria) revelnta. Fig. 4. Natica Ponsonhyi. Fig. 5. Lacuna tenvistriata. Fig. 6. Priotroclms sepulchrcdis. Fig. 7. Mactrinula tryphera. Fig. 8. Lucina (Codakia) angela. Figs. 9, 9 a. Cryptodon vicforialis. Fig. 10. Scintilla callipareia. Fig. 11. Diplodonta holosjihcera. Fig, 12. ? CEdnlina asiatica. VI. — Observations on the Classification of Birds. By Dr. R. W. Shufeldt *. In former papers of mine the classification of various groups of birds has been treated, their osteology, as a rule, being the anatomical system employed and referred to for the purpose. * From the ' Proceediufi^s of the Academy of Natural Sciences of Philadelphiii,' 1898, pp. 489-499. Read by title at the Sixteenth Con-gress of the American Ornithologists' Union, at the United States National Museum, Washington, D.C ,, 17th November, 1898.
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