300 
PLATE III. 
Fig. 21.—Transverse section of the lower bed of Splint Coal 
intersecting a bright layer between two dull ones, showing 
the occurrence of spores of plants in the two latter, but 
not in the bright layer, x 124 diam. 
Figs. 22, 23.—Macrospores from the middle bed of the Splint 
Coal, x 22 diam. 
Figs. 24, 25.—Microspores from the same, x 262 diam. 
Fig. 26.—Horizontal section of the coal constituting the middle 
bed of the Splint Coal, x 124 diam. 
Figs. 27, 28.—Macrospores from the upper bed of the Splint 
Coal, x 22 diam. 
Fig. 29.—Microspores from the same, x 262 diam. 
Fig. 30.—Horizontal section of the coal constituting the upper 
bed of the Splint coal, x 123 diam. 
PLATE IV. 
Fig. 31.—Macrospores from coal taken from near Pittsburg, 
Pennsylvania, U.S., x 22 diam. 
Fig. 32—Another spore from the same, with minute spine-like 
projections on the surface, x 262 diam. 
Fig. 33.—Microspore from the same, x 262 diam. 
Fig. 34.—Horizontal section of the above coal, x 160 diam., 
showing microspores and fragment of a macrospore. Should 
be compared with Fig. 20. 
Fig. 85.—Macrospore, in transverse section, from the Black 
Warrior Coalfield of Alabama, x 160 diam. 
Fig. 36.—Microspores from the same coal, x 262 diam. Should 
be compared with Fig. 4. 
Fig. 37.—Other apparent microspores from the same, x 160 
diam. 
Fig. 38.—Horizontal section the Welsh Four Feet Seam, lower 
bed, x 160 diam. 
Fig. 39.—Horizontal section of Alabama coal, x 160, which 
should be compared with Fig. 38. 
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