PLATE XVII. 



Fig. 



1. A young specimen of A. ladifloreus on extrusion from the egg. Somewhat compressed. 



X 55 diam. 



2. Another specimen eight days older than the preceding, b, stylet-region ; c, point where the 



posterior chamber of the proboscis becomes lost, after curving forward. x 90 

 diam. 



3. Outline of a young specimen of Tetrastemma dorsalis shortly after extrusion from the egg. 



X 350 diam. 



4. The same compressed, so as to exhibit its cellulo-granular structure. X 350 diam. 



5. Young specimen of T. dorsalis, about a week older than the preceding, a, cutaneous 



textures; b, cells and granules of the alimentary tract; c, stylet-region. X 210 diam. 



6. A specimen eight days older than the foregoing, showing a considerable advancement in all 



the organs. X 210 diam. 



7. A young example of N. carcinophila extruded from the body of the adult under pressure. 



It has the same appearance when originating in a free ovum. X 350 diam. 



8. Spermatozoa of Nemer tes gracilis. X 700 diam. 



9. Spermatozoa of iV". carcinophila. X 950 diam. 



10. Spermatozoa of Am/phiporus pulcher. X 700 diam. 



11. Magnified view of the ganglionic region of a large A. ladifloreus y in which a parasitic ovum 



(y) lay imbedded in a granular lobulated mass (y). 



12. Parasitic ovum immediately after removal, a, opaque mass of cells and granules ; b, ventral 



disc; c, oral disc; d, capsule, to which some shreds of the surrounding tissue are 

 adhering. Considerably magnified. 



13. The same ovum some hours afterwards, showing slight contraction of the discs. 



14. Parasite extruded from the capsule, a, opaque cellular and granular mass; b } ventral 



disc ; c, oral disc ; d, oesophageal bulb ; e 9 alimentary caeca ; /and g, large circular 

 granular bodies. 



15. Streaked arrangement of the cutis from the dorsum of Linens gesscrensis. X 210 diam. 



16. View of the cutis of the same species (at a pale portion) as a transparent object. 



X 210 diam. 



17. Portion of the skin of a living Carinella annulata. X 350 diam. 



18. Pigment-cells from the anterior dorsal region of Linens gesserensis. X 350 diam. 



19. Papillae on the snout of the same species. X 210 diam. 



20. Tip of the snout in the same species, with the proboscis partly extruded. X 210 diam. 



21. Posterior extremity and styliform process of Micrura fasciolata. a, central cavity, containing 



fluid; z, anus. X 210 diam. 



22. Posterior extremity of a young example of Z. gesserensis, showing the anal papilla. 



X 210 diam. 



23. Corpuscles of the extruded fluid (page 114) from Borlasia fflizabethce. Highly 



magnified. 



24. Anterior ^extremity of Carinella annulata. a, aperture in snout for proboscis ; b, cephalic 



furrows ; c, cephalic blood-vessel ; m, cephalic sac ; w, mouth. Magnified. 



25. Spermatozoa of Amphiporus bioculatus. X 700 diam. 



26. Spermatozoa of Tetrastemma Robertiance. X 700 diam. 



