1895.] TBBTH OF OBRTALN' POISONOUS SITAKBS. 825 



Fig. 13. Bryopkis mycterizans : left maxilla from below. 



14. „ „ : eye with Harderian gland. 



15. Dryophis prasinm: portion of transverse section of head through 



the base of the grooved tooth, showing the communication between 

 it and the duct of the poison-glaud. 



16. Dryophis prasinus : transverse section of grooved tooth. 



17. „ ,, : section of poison-gland showing three of the 

 alveoli consisting of more or less columnar cells with large granular 

 nuclei at their bases. 



18. Dryophis prasinus : portion of the epithelium of the poison-duct 



while it is inside the gland. (The duct is more or less convoluted 

 and the convex side of the drawing is towards the interior of the 

 duct.) 



19. Dryophis mycterizans : portion of the wall of the poison-duct at a 



point where it leaves the gland. 



20. Oxybelisfulgida: eye with Harderian gland. 



21. „ „ : left maxilla from below. 



22. „ ,, : transverse section through the region of the base of 

 the first grooved tooth. 



23. Eteirodipsas colubriens : head from the right side. 



24. ,, „ : right maxilla from below. 



25. Psammodynastes pulverulentus : posterior portion of the right maxilla 



from below. 



Plate XLV. 



Fig. 1. Caehpeltis lacertina : head from the left side. 



2. „ „ : left ma^dUa from below. 



3. „ „ : transverse section of grooved tooth. 



4. ,, ,, : eye removed, to show the Harderian gland. 



5. „ „ : transverse section through the region of the 

 grooved tooth, showing its communication with the duct of the 

 poison-gland. 



6. Philodryas olfersii: head from the left side. 



7. „ „ : left maxilla from below. 



8. Philodryas schottii: head from the left side. 



9. „ ,, : left maxilla from below. 



10. Leptodira ritjescens : head from the left side (mandible removed) 



11. „ ,, : left maxilla from below. The positions of the 

 reserve grooved teeth are indicated by dotted lines. 



12. Leptodira riifescens: transverse section of grooved tooth. 



13. Leptodira annulata : head from left side. 



14. ,, ., : left maxilla from below. 



15. Thamnodynastes nattereri: left maxilla from below, 



16. „ „ : transverse section of grooved tooth. 



17. Trimerorhiims rhomheatus : head from the left side. 



18. „ „ : left maxilla seen rather obliquely from 



below. 



19. Psammophis sehelans : right maxilla from below. 



20. Homalopsis biwcata : head from right side. 



21. ,, „ : right maxilla from below. 



22. „ „ : transverse section of one of the anterior maxillary 



teeth. 



23. „ „ : transverse section of grooved tooth. 



24. ,. „ : Harderian gland (eye removed). 



25. Cerberus rhytichops : right maxilla from below. 



Plate XL VI. 



Fig. 1. Distira cyanocincta : head from the right side. 



2. Enhydris hardwickii : „ ,, „ 



3. Hydrus platurus : „ „ „ Inferior labial gland 



removed. 



