OF THE FOSSIL PLANTS OF THE COAL MEASURES. 
509 
PLATE XXVII. 
Fig. 26. Segment of the transverse section of a Cctlamites in which the pith was being 
absorbed as far as line of arrested absorption, c'. 
PLATE XXVI. 
Fig. 27. Round scars left by the infranodal canals of a Calamopitus. 
Fig. 28. Oblong scars of another variety of Catamopitus. 
Fig. 29. Internodes of an arenaceous medullary cast of a Catamites. 
Fig. 30. Portion of the internode (k") of fig. 29, enlarged. 
Fig. 31. Portion of a subterranean rhizome of a Catamites with the phragmata or scars 
left by the detached branches. 
Fig. 32. One of the phragmata of fig. 31. 
Fig. 33. Part of a rhizome with a branch in situ. 
Fig. 34. Subterranean base of the aerial stem of a Catamites , exhibiting the points 
whence the roots were given off. 
PLATE XXVIII. 
Fig. 35. Base of the root of a Catamites in situ . 
PLATE XXVII. 
Fig. 36. Lower extremity of the medullary cast of a subterranean branch. 
PLATE XXVIII. 
Fig. 37. Vertical section of the Catamopitus fig. 19, indicating the position of a 
branch, to. 
Fig. 38. Tangential section of part of a large Catamopitus, exhibiting a transverse section 
of an aerial branch. 
Fig. 39. Transverse section of a Catamites , exhibiting a longitudinal section of the base 
of an aerial branch. 
Fig. 40. Single vessel from near the node of an Equisetum maximum . 
PLATE XXIX. 
Fig. 41. Longitudinal section of the stem-wall of an Equisetum maximum, to, part of 
the sheath. 
Fig. 42. Segment of a transverse section of Equisetum maximum. 
Fig. 43. One of the vascular canals (e) of the last figure, with its surrounding tissues, 
more highly magnified. 
4 A 
MDCCCLXXI. 
