STRUCTURE OF THE HAIRS OF MYLODON LISTAI. 411 



Tig. 8. — C1io1ce|)US didactylus. Transverse section through the 

 middle of the length of the hair. The superficial grooves are occupied by 

 shrivelled extra-cortex and alga;. At a the groove is completely, and at b 

 partially closed over by cuticle. X 150. 



Fig. 9. — Portion of the hair seen from the side. X 150. 



Figs. 10 and 11. — Transverse section and side view of the hair at a point 

 one eighth of the total length from the base, x 150. 



Fig. 12. — Optical section of a hair of a sofl-furred specimen of Cholcepus 

 didactylus, showing in the groove, which is in focus on the right side of the 

 figure, the cell outlines of the extra-cortex, x 150. 



Fig. 13. — Transverse section of the saaie hair, x 150. 



Fig. 14. — Myrmecophaga jubata. Transverse section through the 

 middle of the length of the hair, x 100. 



Fig. 15. — Transverse section through the hair at about 3 mm. above the 

 surface of the skin. X 100. 



Fig. 16. — Tamandua tetradactyla. Transverse section through the 

 middle of the length of the hair, x 150. 



Fig. 17. — C hlamydophorus truncatus. Hair seen in transverse sec- 

 tion and from the side. X 600. 



Fig. 18. — Dasypus sexcinctus. Transverse section through the middle 

 of the hair, x 100. 



Fig. 19. — Dasypus villosus. Transverse section through the middle 

 of the hair, x 100. 



Fig. 20. — Tolypeutes couurus. Transverse section through the middle 

 of the hair, x 100. 



Fig. 21. — Middle pari of the hair seen from the side; upper part in optica, 

 section, lower part with the surface in focus, x 100. 



Fig. 22. — Transverse section through the hair at about one quarter of its 

 length from the base, x 100. 



Fig. 23. — Tatusia pilosa. Transverse section through the middle of 

 the length of the hair. X 150. 



Fig. 24. — Mylodou Listai. Transverse section through the middle of 

 the hair, x 100. 



Fig. 25. — Portion of the hair about one quarter of the total length from 

 the basal end ; surface in focus to show the cuticular scaling, x 100. 



