EQUISETITES. 33 



with funnel-shaped sheaths. The details are not clearly shown, 

 and unless the specimen is itself very much better than the figure 

 implies, the evidence is quite insufficient to refer this fragment 

 to Equisetites, or indeed to any other genus. Judging by the 

 figure, it might be equally well placed in the genus Phyllotheca. 

 This determination must therefore remain doubtful for the present. 



Known only from Argentina. 



Not represented in the British Museum collection. 



Obscure Articulated Casts. 



V. 7597. This specimen shows what appears to be the 

 impression of the woody tissues of a stem on either side of 

 an articulated cast, some 6*5 cm. in length. At first sight it 

 somewhat resembles a badly-preserved Calamitean pith-cast, as 

 I have already pointed out elsewhere, 1 but it is doubtful if the 

 preservation is sufficiently good to determine it even generically. 

 There are no ridges or grooves to be seen on the internodes, nor any 

 trace of branch or other scars. The internodes vary in length, and 

 the nodal constrictions, if they really are of this nature, do not 

 correspond with those of the impression of the woody tissues. 



Tuli Coalfield, Rhodesia. Pres. by A. J. C. Jlolyneux, Esq., 1901. 



V. 3618. Figured by Seward (97 1 ), p. 325, pi. xxii, fig. -ib. 

 This specimen consists of a long, finely ribbed cast, 27 cm. in 

 length, and 5'5 cm. in breadth. The grooves between the ribs are 

 1-1 "8 nun. broad. There are no trustworthy indications of nodes. 

 Mr. Seward has remarked that it is difficult to decide whether this 

 specimen is a broad leaf with parallel veins, or a flattened stem-cast 

 with long internodes. He inclines towards the latter conclusion, 

 doubtfully comparing this specimen with stems of Calamites. 



Vereeniging, Transvaal. Pres. by I). Draper, Esq., 1897. 



V. 3619. Figured by Seward (97 1 ), p. 326, pi. xxiv, fig. 2. 

 A long stem-cast, 26-5 cm. in length, and 2 cm. broad, with 

 a strong transverse ridge near one end of the specimen, which 

 possibly marks the position of a node. The precise nature of this 

 fossil is very doubtful. Mr. Seward has compared it, with much 



1 Arber (03), p. 289. 



