PLATE X. 



Fig. 



1. First transverse section of the snout of Amp kiporus lactifloreus, a, aperture for the pro- 



boscis ; b, delicate superficial film seen in recently mounted preparations ; c, dermal layer 

 X 210 diam. 



2. Section of the snout of the same species somewhat posterior to the former, showing the 



channel for the proboscis (a), and the cephalic blood-vessels (/), just before they complete 

 the arch. X 210 diam. 



3. Transverse section of the snout of A. lactifloreus in front of the ganglia, somewhat flattened 



from pressure. 1, 2, 3, 4, 5, 6, the various bands of fibres described in the text; e, lon- 

 gitudinal muscular fibres ; /, section of cephalic blood-vessel ; m, section of cephalic sac. 

 X 210 diam. 



4. Transverse section of the body-wall of A. lactifloreus. a, the cutis, with its cells and areolae, 



somewhat compressed ; b, structureless basement-layer ; c, circular muscular coat ; d, longi- 

 tudinal muscular layer; e, delicate fibres proceeding from the latter to the viscera. 

 X 700 diam. 



5. View of a portion of skin snipped from a living specimen, under moderate pressure. 



X 350 diam. 



6. Skin from the caudal region of a small example, under slight compression, a, the ciliated free 



margin. X 350 diam. 



7. Elements of the skin as they escape from the living animal, a, granular cells; b, mucous 



or gelatinous masses having the appearance of oil-globules. X 350 diam. 



8. Transverse section of the anterior part of the cephalic ganglia, in a specimen which had been 



put under chloroform and then immersed in strong alcohol, so as to protrude a small 

 portion of the proboscis. The inferior commissure (^) is not much stretched, but the 

 superior (/) is almost imperceptible;^', oesophagus. X 55 diam. 



9. Section of the region anterior to the former in the same specimen. The invagination of the 



proboscis and the changes in the region surrounding it are well shown, a, the anterior' 

 and hence outer fold; /, cephalic blood-vessel. X 90 diam. 



10. Transverse section of the body of a specimen of A. lactifloreus, in which no reproductive 



elements are visible. The dilatation of the proboscidian chamber (o) is characteristic, 

 and the walls of the digestive cavity are pressed downwards and outwards. X 55 

 diam. 



11. Corpuscles of the proboscidian fluid from Tetrastemma flavida. X 350 diam. 



12. Portion of the glandular surface of the posterior chamber of the proboscis of A. lactifloreus 



in its normal condition. X 350 diam. 



13. Portion of the inner surface of the same chamber viewed in situ under pressure. The 



papillae are hirsute, and their contents scattered over the surface of the organ. 

 X 350 diam. 



14. Corpuscles of the proboscidian fluid from Tetrastemma dorsalis. X 350 diam. 



15. Corpuscles of the proboscidian fluid from A. lactifloreus. a, minute nucleated cells and 



granules; b, spindle-shaped corpuscles. X 500 diam. 



16. The proboscidian aperture in the snout of the same species. X 210 diam. 



17. Isolated gland-cells from the posterior chamber of the proboscis. X 350 diam. 



18. Stylet from a marginal sac of A, lactifloreus, having an abnormal point, and the remains 



of a globule at the base. X 210 diam. 



19. Glandular papillae from the anterior region of the proboscis of Tetrastemma vermicula, seen 



on the free edge of the everted organ, x 700 diam. 



20. Lanceolate and pedicellate papillae from the first part of the anterior region of the proboscis 



of the same species. X 210 diam. 



21. Portion of the everted inner surface of the posterior chamber of the proboscis. The 



glandular papillae have for the most part burst and become minutely hirsute. X 350 

 diam. 



