PLATE 4 
EXPLANATION OF FIGURES 
4 Section of the same hair, between D-H, figure 70. M, medulla. X 120. 
5 Section of the same hair, between E-F, figure 70. M, medulla x 120. 
6 Cuticular scales of the same hair, midway between the base and tip. xX 
77 Guide figure. 
78 Section of the spiny flattened hair of the top of the head, between B-C, 
figure 77. M, medulla. X 20. 
79 Section of the same hair, betwen C-D, figure 77. M, medulla.  X 22. 
80 Bulb of the same hair, at F, figure 77. M, medulla; S, level of the epi- 
dermis (mouth of the follicle). > 32. 
81 Cuticular scales of the same hair at point D, figure 77. X 20. 
82 Section of the same hair, near D, figurs 77, showing the isolated group of 
adventitious medullary cells sometimes present in different portions of the shaft. 
M, medullary cells. X 27. 
83 Guide figure. 
84 Tip of the wavy hair from the auricular depression, at the pigmented por- 
tion, A-B, figure 83. M, medulla. > 500. 
85 Section of the same hair, between B-C, figure 83. M, medulla;CU, cuticle; 
CO, cortex. X 450. 
86 Section of the same hair, at D, figure 83. M, medulla; CU, cuticle; CO, 
cortex. X 450. 
87 Cuticular scales of the same hair, midway between C-D, figure 83. X 500. 
88 Shaft of the flattened spiny hair of the venter, midway between the base 
and tip. xX 18. 
89 Shaft of the same hair, near the base. M, medulla. X 18. 
90 Shaft of the long wavy hair of the venter, midway between the base and 
tip. X 40. 
91 Shaft of the same hair near the basé. M, medulla. > 40. 
92 Transverse section of the spiny flattened hair of the venter, midway be- 
tween the base and tip. CU, cuticle; CO, cortex.  X 20. 
93 Transverse section of the same hair near the base. CU, cuticle; CO, cor- 
tex. % 20. 
94 Median longitudinal section through large spine of the dorsum, midway 
between the base and tip. M, medulla; CU, cuticle; CO, cortex. X 4. 
95 Median longitudinal section through the tip of the same spine. M, med- 
ulla; CU, cuticle; CO, cortex. X 4. 
96 Transverse section through same spine, midway between the base and tip. 
M, medulla; CU, cuticle; CO, cortex. X 4. 
97 Showing the cuticular scales near the base of the same spine. B, portion 
within the follicle (bulb). > 4. 
98 Stereogram of portion of dorsal spine, sectioned, and with the ectal end 
broken. The method of fracturing may be indicative of the form of the horny, 
coalesced, fusiform corticular cells which compose the cortex of the spine. M, 
medulla; CU, cuticle; CO, cortex; B.CO, broken cortex. X 4. 
494 
