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Show 1891.] ON THE A N A T O M Y O F O R N I T H O R H Y N C H U S . 575 et inter se distinctius separatis, pedibus sex posticis aurantiis, luteis; ab O. amazonico, E. Sim., praesertim differt cephalothorace longiore et humiliore. Ab 0. walckenaeri, M'Leay (sp. quae mihi est ignota), verisimiliter distinctus est. EXPLANATION OF PLATE XLII. Fig. 1. Dysderina principalis, p. 557. Lateral view of palp, of 3. 2. Dysderina spinigera, p. 558. Leg. 3. . Palp, of 3> lateral view. 4. Pelicinus marmoratus, p. 559. Lateral view of palp, of 3. 5. Opopcea deserticola, p. 560. Lateral view of palp, of 3. 6. Oonops spinimanus, p. 565*. Lateral view of leg. 7. Oonops globimanus, p. 563. Lateral view of palp, of 3. 8. Oonops pulicarius, p. 564. Lateral view of palp, of 3. 9. Oonops figuratus, p. 564. Abdomen from above. 10. Ochyrocera arietina, p. 566. Lateral view of palp, of 3- 11. Ochyrocera quinauevittata, p. 566. Lateral view of palp, of 3. 12. Theoclia radiata, p. 567. Lateral view of palp, of 3. 13. Scytodes longipes, p. 567. Lateral view of palp, of 3. 14. Scytodes hebraica, p. 568. Cephalothorax from above. 15. Scytodes bajula, p. 569. Lateral view of palp, of 3. 16, 17. Scytodes linearipes, p. 570. Cepbalothorax from above. 18. Nops coccineus, p. 572. Lateral view of palp of 3 • 4. On the Nose, the Organ of Jacobson, and the Dumb-Bone in the Ornithorhynchus. By JOHNSON SYMINGTON, M.D., F.R.S.E., Lecturer on Anatomy, Minto House, Edinburgh1. (Communicated by FRANK E. BEDDARD, M.A., F.Z.S.) [Eeceived November 5, 1891.] (Plates XLIII. & XLIV.) Notwithstanding the great amount of attention that has been devoted to the anatomy of the Ornithorhynchus since its discovery nearly a century ago, its nasal cavities appear to have been, to a large extent, overlooked. Meckel (1), Owen (2), Albrecht (3), Turner (4), Zuckerkandl (5), and Parker (6) have examined and described certain portions of the nose, but no account of its microscopic structure appears to have hitherto been published, and several points in its naked-eye anatomy have been overlooked or misinterpreted. The following communication is based upon the study of a series of coronal sections of the head of a nearly adult female, together with the examination of several dissected specimens and macerated skulls. The sections were cut after having been decalcified and embedded in paraffin. Most of the Ornithorhynchi which have reached this country have not been sufficiently well preserved to admit of their microscopic examination, and I am greatly indebted 1 From the Embryological Laboratory, University of Edinburgh. PROC ZOOL. Soc-1891, No. XXXIX. 39 |