SILURIAN. 245 



PACHYTHECA, Hooker, 1861. 

 In Salter, Quart. Journ. Geol. Soc. vol. xvii. p. 162. 



Pachytheca sphaerica, Hooker. 



Hooker in Salter, Quart. Jouru. Geol. Soc. vol. xvii. p. 162, 1861. 



Pachytheca. 



Etheridge, Quart. Journ. Geol. Soc. vol. xxxvii. pi. xxv. figs. 8, 9. 



^Etheotesta. 



Dawson, Foss. Plants, Devon, and Upper Sil. Form, of Canada, pt. ii. 



p. 108, fig. 1. 



Horizon. Upper Silurian, Ludlow Bone-Bed. 

 Locality. British. Herefordshire : Much March. 



INCERT^E SEDIS. 



STEM. 



Remarks. The vegetable matter has been converted into a bright coaly 

 substance. 



Horizon. Upper Silurian. 



Locality. British. Denbighshire : Corwen (Presented by H. Hicks, Esq., 

 M.D., F.E.S.). 



VEGETABLE IMPRESSIONS. 



Remarks. These specimens show carbonized remains of fossil plants. 

 Horizon. Upper Silurian, Downton Tilestones, Upper Ludlow. 

 Locality. British. Herefordshire : Dormington. 



