LIST AND DESCRIPTION OF PLATES 



CHAPTER I. 



PART I. 



Fig. 1, page 7. A Hair of the Head of one of the Oval-Haired Species; a, the vessels; 

 b, the follicle; c, the button; d, a part of the shaft, with the cortex; e, another part of the 

 shaft, with the cortex removed, exposing the fibres ; f, another still, with the cortex and 

 fibres removed, exposing the central canal, interrupted. 



Fig. 2, page 8. Hair and Wool contrasted. A, hair, (the scales having the appearance 

 of transverse stria3 only;) B, wool, (with the scales more apparent.) 



Fig. 3, page 9. Outline of a Feather; a, the cylinder; b, the inferior navel; c, the 

 superior navel; d, the stalk; e, the beard and steno-beard. 



Fig. 4, page 11. The Ostrich Feather. 



Fig. 5, page 11. The Eye-Lash of the Ostrich; c, the cylinder, and a, the inferior 

 navel; b, the superior navel; e, the beard and steno-beard. 



Fig. 6, page 12. The Pile of the Ornithorynchus ; a, the button; b, a part of the shaft, 

 (marked with dark colored varying lines;) c, the neck; d, the broad portion of the shaft, 

 (with disseminated coloring matter and the spire ;) e, anterior part of the shaft, (gradually 

 narrowing;) /, the apex. 



PART II. 



Fig. 7, page 14. The internal arrangement of one of the divisions of the Mantle of the 

 Armadillo. A, the main arterial trunk; B, the fusiform follicles; C, the hair-like pro- 

 cesses; D, the orbicular capsule. 1, 2, 3 and 4, horizontal limbs; 5, inclined limb; 6, 

 anastomosing branches; 7, the largest branch; 8, branches which do not anastomose; 9, 

 interfolical vessels; 0, culs de sac. 



Fig. 8, page 16. Hair-like Processes issuing from between and under the Scales of the 

 Manis, (showing its shape, coloring matter in irregular lines and dots, and a wart-like 

 protuberance.) 



Fig. 9, page 16. Scales upon the Prehensile Tail of the Possum. 



Fig. 10 a, page 17. A transverse section of the Horn of the Rhinoceros, (showing the 

 e'nds of two hairs.) 



Fig. 10 b, page 17. A horizontal section of the same, (also showing the hairs.) 



Fig. 11, page 19 A transverse section of the Spine of the Porcupine, (showing its 

 complicated internal conformation.) 

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