OF THE FOSSIL PLANTS OF THE COAL-MEASURES. 
529 
PLATE 18. 
Fig. 30. Peripheral extremity of one of the outermost cells of fig. 29. 
170 diameters. 
PLATE 17. 
Enlarged 
Fig. 31. Transverse section of a specimen apparently uniting Sporocarpon elegans 
with S. comp actum, and filled with large cells. Enlarged 170 diameters. 
PLATE 18. 
Figs. 32, 33, and 34. Mother-cells, containing daughter-cells, from the interior of the 
specimen of Sporocarpon represented in fig. 69a of the memoir, Part IX. 
Enlarged 322 diameters. 
PLATE 17. 
Fig. 35. Transverse section of Sporocarpon pachyderma. a. Outer wall of branch¬ 
ing and interlacing cells. b. Inner membrane. Enlarged 162 diameters. 
Fig. 36. Transverse section of a second specimen of S. pachyderma with the inner 
membrane, b, enclosing small spore-like granules. Enlarged 162 diameters. 
PLATE 18. 
Fig. 37. A portion of a tangential section of the outer wall a, of a specimen like 
fig. 36. Enlarged 750 diameters. a. Transverse sections of tubular 
portions of the branching cells, b. Intercellular meshes enclosed within 
anastomosing branches of the cells. 
PLATE 17. 
Fig. 38. Transverse section of Sporocarpon asteroides. Enlarged 163 diameters. 
PLATE 18. 
Fig. 39. Transverse section of Sporocarpon ornatum. a. Inner layer of the 
conceptacle wall. b. Thick middle layer, c. Strongly marked cells 
occupying indented portions of the organism, d. Very large, loosely 
aggregated cells, occupying its prominent ridges. Enlarged 16 diameters. 
Traquaria (Carruthers). 
PLATE 19. 
Fig. 40. A young example, with the unbranched spines in a flexible state. Enlarged 
160 diameters, a. Wall of the capsule, b. Hollow muricated spines. 
e, An ill-defined investing tissue, 
