54 EQTJISETITES. 



1850. Equisetites columnaris, linger, Gen. spec, plant, foss. p. 56. 

 E. lateralis, ibid. p. 59. 



1851. Asterophyllites ? lateralis, Bunbury, Quart. Journ. Geol. Soc. vol. vii. 



p. 189. 



1854. Equisetites lateralis, Morris, Brit. Foss. p. 8. 

 1856. Calamites lateralis, Zigno, Flor. foss. Oolit. vol. i. p. 46, pi. iii. fig. 3. 



Equisetites columnaris, ibid. p. 65. 



E. Veronensis, ibid. p. 64, pi. vi. 

 1864. Equisetites columnaris, Leckeuby, Quart. Journ. Geol. Soc. vol. xx. p. 77. 



E. lateralis, ibid. p. 77. 

 1869. Equisetum columnare, Schimper, Trait, pal. veg. vol. i. p. 266. 



Schizoneura ? lateralis, ibid. p. 284. 



1873. Equisetum columnare, Saporta, Pal. Franc,, vol. i. p. 254, pi. xxx. 

 fig. 5. 



E. Veronense, ibid. pi. xxx. fig. 6. 



Cf. Equisetum Duvalii, ibid. p. 248, pi. xxx. figs. 1-4. 

 1875. Equisetites columnaris, Phillips, Geol. Yorks. p. 197, Lign. 4 and 5. 



E. lateralis, ibid. p. 197, pi. x. fig. 3. 



1877. Cf. Phyllotheca sibirica, Heer, Flor. foss. Arct. vol. iv. (2 *), pi. iv. p. 43. 



1878. Cf. P. sibirica, ibid. vol. v. (2), p. 4, pi. i. figs. 9-15. 

 1882. Cf. P. sibirica, ibid. vol. vi. (2,), p. 9, pi. ii. figs. 5 and 6. 

 1892. Equisetum columnare, Fox-Strangways, Tab. foss. p. 127. 



Phyllotheca lateralis, ibid. p. 128. 



1894. ? Equisetum blandum, Raciborski, Flor. Kopal. p. 233, pi. xxvii. 

 figs. 17-27. 



Type-specimen. Paris Museum. The specimens from Whitby 

 on which. Brongniart's diagnosis was founded were sent to him by 

 the Philosophical Society of York. 



Stem reaching a diameter of 5-6 cm., with intemodes 13-14 cm. 

 long. The nodal region slightly swollen, at least in the larger 

 stems or branches, bearing leaf-sheaths closely adpressed to the 

 stem with 70-80 linear acuminate teeth. In the smaller branches 

 the leaf-sheaths consist of a smaller number of segments, and 

 occasionally occur as isolated sheaths with radiating linear teeth 

 apart from the branches or lying on the surface of an internode. 

 In the thicker specimens the free distal ends of the teeth have 

 usually been broken off, the sheaths having a truncated margin. 

 The leaf-segments are separated from one another by a fairly deep 

 V-shaped groove, which widens towards the edge of the leaf- 

 sheath, where the teeth become free. The median portion of each 



1 The figure placed after the number of the volume indicates the position of 

 the paper quoted in the particular volume of the Flor. foss. Arct. 



