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Show 826 ON T H E GLANDS A N D TEETH OP POISONOUS SNAKES. [Nov. 19, Fig. 4. Platurus fasciatus: head from the right side. 5. „ „ : Longitudinal section of the head taken through the poison-gland and duct. 6. Hydrus platurus, var. alternans: left poison-gland and duct from side. '• >> >> >> » » » i> >> above. 8. Distira cyanocincta: right maxilla from below. 109.. HEyndhryudsr isp lhaatrudrwuisc kii: 11. Platurus fasciatus 12. „ 13. „ „ : long , „ „ below. , „ „ side. _ tudinal section through the base of the external poison-fang, showing the enlargement of the duct (d.) to form the vertical cavity (e.d.); the muscular mass (m.) is situated directly in front of the base of the tooth (vide fig. 14, m.), and the communication between this cavity and the groove of the tooth is not shown. 14. Enhydris hardwickii: transverse section through the bases of the poison-fangs, showing the communication between the enlarged extremity of the duct and the groove of the more internally situated tooth. 15. Distira cyanocincta: transverse section of the poison-gland and the superior labial gland taken at a point about through the middle of the eye, the former is gradually passing into the duct and the latter is increasing in size anteriorly. The artery (a.) and vein {v.) are the afferent and efferent blood-vessels of the large blood-sinuse6 surrounding the maxillary teeth. 16. Hydrus platurus, var. alternans : Harderian gland and eye. 17. Distira cyanocincta: Harderian gland and eye. 18. Platurus fasciatus: „ „ „ 19. Enhydris hardwickii: Harderian gland (eye removed). 20. Hydrus platurus: transverse section of poison-tooth. 21. Platurus fasciatus : transverse section of poison-tooth. 22. Enhydris hardwickii: „ „ „ „ a. Artery. av. Alveoli of gland. ct. Connective tissue (interstitial). d. Duct of poison-gland. d.s.l. One of the ducts of superior labial gland. e.d. Enlarged distal end of the duct of the poison-gland. ep. Epithelial cells of duct. ep.gl. Glandular (?) epithelial cells of duct. gl.i.l. Inferior labial gland. gl.s.l. Superior labial gland. gr. Groove of poison-fang. H.gl. Harderian gland. m. Muscular pad in front of the base of poison-fang. mx. Maxilla. p. Poison-tooth (functional). p.r. Poison-tooth (reserve). p.c. Pulp-cavity. p.gl. Poison-gland. t. Transpalatine. v. Vein. |
