OF THE FOSSIL PLANTS OF THE COAL-MEASURES. 
531 
Zygosporites. 
Fig. 51. Zygosporites brevipes. Enlarged 637 diameters. 
Fig. 52. Single ray of Zygosporites brevipes. Enlarged 2258 diameters. 
Fig. 53. Zygosporites brevipes. Enlarged 850 diameters. 
Fig. 54. Zygosporites longipes. Enlarged 450 diameters. 
Fig. 55. Zygosporites brevipes, containing cells in its interior. 
Fig. 56. Zygosporites brevipes, exhibiting an inner membrane. 
PLATE 20. 
A tangential section of Sporocarpon elegans. a. Cells seen at the surface 
of the sphere, b. Peripheral prolongation of the cells into hairs, d. Con¬ 
stricted portions of the hour-glass cells, e. Similar constricted portions, 
as seen under a lens of high penetrating power, and showing the radiating 
walls of the middle layer of cells (fig. 28 , e), filling up the intervals between 
the constricted portions of the hour-glass cells. 
Transverse section of Zygosporites (?) oblongus. Enlarged 1260 diameters. 
Tangential section of the same. 
Miscellaneous objects. 
Fig. 60. Part of a transverse section of a branch of a Dadoxylon, exhibiting a 
pair of cellular prolongations of the pith, apparently destined to form the 
medullse of two branches. Enlarged 10 diameters. 
PLATE 19. 
Fig. 61. Slightly oblique longitudinal section of a Lagenostoma ovoides. a. Testa. 
cl. Inner layer of testa, b. Canopy, c. Lagenostome. g. Embryosac. 
Enlarged 18 diameters. 
Fig. 62. Portion of the testa, a, of fig. 61, composed of sclerenchymatous cells. 
Enlarged 200 diameters. 
Fig. 63. Portion of the inner layer (fig. 61, aj, of the testa, composed of spiral pro- 
senchymatous cells. Enlarged 249 diameters. 
PLATE 20. 
Fig 64. Longitudinal section through the shorter diameter of Cardiocarpon 
cmomalum. a. Exotesta. b. Endotesta. cl. Prolonged micropile. 
i. Chalaza. i'. Funiculus (?) 
Fig. 65. Fragment of bark perforated by zylophagous animals of various sizes. 
Fig. 66. Copros (a, b') of zylophagous animals, left in their borings. 
Fig. 57. 
Fig. 58. 
Fig. 59. 
