128 BUCKLANDIA. 



are much more acute. The form of many of the leaf base scars 

 points to a partially decayed petiole rather than a clean-cut 

 surface of a persistent corky base. Cf. Carruthers, loc. cit. 

 pi. liv. fig. 1 ; cf. also Fittonia. Til gate Forest. 



V. 3309. Figured by Carruthers, pi. liv. fig. 4, as Bucldandia 

 Mantelli. 



In this specimen the two kinds of scars are clearly shown, 

 also the increased diameter of the axis where the large scars 

 occur. The lateral angles of the scale scars are more obviously 

 truncate than those of the petiole bases. Cf. 46644. Cuckfield. 



V. 3310. Figured by Carruthers, pi. liv. fig. 2. 



In describing this specimen Carruthers speaks of a " triradiate 

 ridge " on the surface of the scars, but I am unable to recognize 

 any such character ; the markings are probably the result of 

 some secondary changes and cannot be regarded as an original 

 character. 



V. 713. This specimen shows the clathrarian pith cast, as in 

 8262, but much more clearly. The flattened internal cast has 

 a length of 45 cm., and exhibits the usual surface features 

 characteristic of Clatltraria Lyelli. Part of it projects beyond 

 the surrounding cortical cast, but it is enclosed to some extent 

 by the remains of leaf bases, and between the cortical shell and 

 the pith there is a space about 5 mm. in width, here and there 

 filled with coal ; this no doubt represents the portion of the stem 

 originally occupied by woody tissue. The pith case is flattened 

 and shows alternations of broader and narrower portions ; the 

 surface markings, in the form of narrower and tapered ridges, 

 do not appear to be disposed with any regularity. The large 

 leaf bases are approximately 3 cm. in depth and 4'3 cm. in breadth. 

 Some of the leaf bases have projecting upper surfaces, as in 

 V. 3308, suggesting partially decayed petioles, but in other parts 

 of the stem the scars are much flatter and more like the clean- 

 cut bases of detached fronds. 



V. 713rt. 23 cm. in length. In the broader and lower part 

 of the specimen the petiole bases are fairly large, and have much 

 the same form as in V. 713. 



